A worker prepares an outdoor igloo pod at a restaurant ahead of reopening on April 12, as lockdown restrictions are eased in England, amid the spread of the coronavirus disease (COVID-19) pandemic, in London, Britain, April 6, 2021. REUTERS/Toby Melville

A worker prepares an outdoor igloo pod at a restaurant ahead of reopening on April 12, as lockdown restrictions are eased in England, amid the spread of the coronavirus disease (COVID-19) pandemic, in London, Britain, April 6, 2021. REUTERS/Toby Melville

Tourists sit inside "Igloo Cafe", a cafe prepared with snow and ice, at Gulmarg, a ski resort and one of the main tourist attractions in Kashmir region, January 28, 2021. REUTERS/Sanna Irshad Mattoo

A man comes out of "Igloo Cafe", a cafe prepared with snow and ice, at Gulmarg, a ski resort and one of the main tourist attractions in Kashmir region, January 28, 2021. REUTERS/Sanna Irshad Mattoo

Tourists drink inside "Igloo Cafe", a cafe prepared with snow and ice, at Gulmarg, a ski resort and one of the main tourist attractions in Kashmir region, January 28, 2021. REUTERS/Sanna Irshad Mattoo

A view of "Igloo Cafe", a cafe prepared with snow and ice, at Gulmarg, a ski resort and one of the main tourist attractions in Kashmir region, January 28, 2021. REUTERS/Sanna Irshad Mattoo

Tourists look at the ceiling of "Igloo Cafe", a cafe prepared with snow and ice, at Gulmarg, a ski resort and one of the main tourist attractions in Kashmir region, January 28, 2021. REUTERS/Sanna Irshad Mattoo

Tourists drink Kashmiri Kahwa tea inside "Igloo Cafe", a cafe prepared with snow and ice, at Gulmarg, a ski resort and one of the main tourist attractions in Kashmir region, January 28, 2021. REUTERS/Sanna Irshad Mattoo

A waiter comes out of "Igloo Cafe", a cafe prepared with snow and ice, after serving customers at Gulmarg, a ski resort and one of the main tourist attractions in Kashmir region, January 28, 2021. REUTERS/Sanna Irshad Mattoo TPX IMAGES OF THE DAY

A tourist uses his mobile phone to film as he enters "Igloo Cafe", a cafe prepared with snow and ice, at Gulmarg, a ski resort and one of the main tourist attractions in Kashmir region, January 28, 2021. REUTERS/Sanna Irshad Mattoo

A woman waits to go inside of an igloo with Christmas decorations as the global outbreak of the coronavirus disease (COVID-19) continues, in New York City, U.S., December 9, 2020. REUTERS/Eduardo Munoz

The exterior of a hotel room made from snow and ice, is pictured outside an igloo at the Rifugio Capanna Presena, located 2,700 metres above sea level on the Presena glacier, in Passo del Tonale, Italy, January 9, 2020. Picture taken January 9, 2020. REUTERS/Yara Nardi

A musician plays drums made from ice during a performance at the Ice Music Festival in an igloo at 2,600 metres above sea level on the Presena Glacier, in Passo Paradiso, Italy, January 9, 2020. Picture taken January 9, 2020. REUTERS/Yara Nardi

A musician plays a violin made from ice during a performance at the Ice Music Festival in an igloo at 2,600 metres above sea level on the Presena Glacier, in Passo Paradiso, Italy, January 9, 2020. Picture taken January 9, 2020. REUTERS/Yara Nardi TPX IMAGES OF THE DAY

A violin made from ice is displayed at the Ice Music Festival in an igloo at 2,600 metres above sea level on the Presena glacier, in Passo Paradiso, Italy, January 9, 2020. Picture taken January 9, 2020. REUTERS/Yara Nardi

A musician plays a violin made from ice during a performance at the Ice Music Festival in an igloo at 2,600 metres above sea level on the Presena Glacier, in Passo Paradiso, Italy, January 9, 2020. Picture taken January 9, 2020. REUTERS/Yara Nardi

Three igloos that have been turned into hotel rooms known as "ice rooms" are pictured next to the Rifugio Capanna Presena, located 2,700 metres above sea level on the Presena glacier, in Passo del Tonale, Italy, January 9, 2020. Picture taken January 9, 2020. REUTERS/Yara Nardi

A musician plays a violin made from ice during a performance at the Ice Music Festival in an igloo at 2,600 metres above sea level on the Presena Glacier, in Passo Paradiso, Italy, January 9, 2020. Picture taken January 9, 2020. REUTERS/Yara Nardi

Musicians play instruments made from ice during a performance at the Ice Music Festival in an igloo at 2,600 metres above sea level on the Presena Glacier, in Passo Paradiso, Italy, January 9, 2020. Picture taken January 9, 2020. REUTERS/Yara Nardi

A hotel room made from snow and ice is pictured inside an igloo, know as an "ice room" at the Rifugio Capanna Presena, located 2,700 metres above sea level on the Presena glacier, in Passo del Tonale, Italy, January 9, 2020. Picture taken January 9, 2020. REUTERS/Yara Nardi

Musical instruments made from ice are displayed at the Ice Music Festival in an igloo at 2,600 metres above sea level on the Presena Glacier, in Passo Paradiso, Italy, January 9, 2020. Picture taken January 9, 2020. REUTERS/Yara Nardi

A musician plays a xylophone made from ice during a performance at the Ice Music Festival in an igloo at 2,600 metres above sea level on the Presena Glacier, in Passo Paradiso, Italy, January 9, 2020. Picture taken January 9, 2020. REUTERS/Yara Nardi

A violin made from ice is displayed at the Ice Music Festival in an igloo at 2,600 metres above sea level on the Presena glacier, in Passo Paradiso, Italy, January 9, 2020. Picture taken January 9, 2020. REUTERS/Yara Nardi

Musicians play instruments made from ice during a performance at the Ice Music Festival in an igloo at 2,600 metres above sea level on the Presena Glacier, in Passo Paradiso, Italy, January 9, 2020. Picture taken January 9, 2020. REUTERS/Yara Nardi

A musician plays a guitar made from ice during a performance at the Ice Music Festival in an igloo at 2,600 metres above sea level on the Presena Glacier, in Passo Paradiso, Italy, January 9, 2020. Picture taken January 9, 2020. REUTERS/Yara Nardi

A musician plays a cello made from ice during a performance at the Ice Music Festival in an igloo at 2,600 metres above sea level on the Presena Glacier, in Passo Paradiso, Italy, January 9, 2020. Picture taken January 9, 2020. REUTERS/Yara Nardi

A violin made from ice is displayed at the Ice Music Festival in an igloo at 2,600 metres above sea level on the Presena glacier, in Passo Paradiso, Italy, January 9, 2020. Picture taken January 9, 2020. REUTERS/Yara Nardi

Revellers dressed as Santa Claus and other holiday themed outfits celebrate inside an igloo at a rooftop bar during the annual SantaCon event in New York City, New York, U.S., December 9, 2017. REUTERS/Elizabeth Shafiroff

The Winter Igloos are seen at the Watergate Hotel's Whiskey Garden in Washington, U.S., November 29, 2017. REUTERS/Aaron P. Bernstein

A Winter Igloo is seen at the Watergate Hotel's Whiskey Garden in Washington, U.S., November 29, 2017. REUTERS/Aaron P. Bernstein

People pass an inflatable igloo as they participate in the Cold Water Swimming Championship at Tooting Bec Lido in south London, Britain January 28, 2017. REUTERS/Neil Hall

Denmark's Crown Prince Frederik (top) and his wife Crown Princess Mary meet a local child at an exhibition featuring an igloo made of corrugated plastic and Greenland in Tokyo March 28, 2015. REUTERS/Toru Hanai

Denmark's Crown Prince Frederik (R) and his wife Crown Princess Mary attend an exhibition featuring an igloo made of corrugated plastic and Greenland in Tokyo March 28, 2015. REUTERS/Toru Hanai

Denmark's Crown Prince Frederik (C) constructs an igloo made of corrugated plastic with Japanese architect Professor Toshihiko Suzuki (3rd L) as Crown Princess Mary looks on behind Frederik at an exhibition featuring the igloo and Greenland in Tokyo March 28, 2015. REUTERS/Toru Hanai

Denmark's Crown Prince Frederik (R) looks at his wife Crown Princess Mary emerging from an igloo made of corrugated plastic at an exhibition featuring the igloo and Greenland in Tokyo March 28, 2015. REUTERS/Toru Hanai

Mustard gas-filled 105mm projectiles are seen inside a chemical storage igloo, at the Pueblo Chemical Depot in an undated photo provided by the U.S. Army Chemical Materials Activity (CMA) in Pueblo, Colorado. The destruction of 2,600 tons of World War Two-era mustard agent weapons banned by international treaty began on March 18, 2015 at a U.S. Army depot in southern Colorado, officials said. REUTERS/U.S. Army Chemical Materials Activity/handout via Reuters (UNITED STATES - Tags: MILITARY SCIENCE TECHNOLOGY)

Irene Kornelly (R), chairperson of the Colorado Citizen?s Advisory Commission, is briefed on the storage of mustard-filled 105mm projectiles inside a chemical storage igloo, along with staff of the Colorado Department of Public Health and Environment in an undated photo provided by the U.S. Army Chemical Materials Activity (CMA) in Pueblo, Colorado. The destruction of 2,600 tons of World War Two-era mustard agent weapons banned by international treaty began on March 18, 2015 at a U.S. Army depot in southern Colorado, officials said. REUTERS/U.S. Army Chemical Materials Activity/Handout via Reuters (UNITED STATES - Tags: MILITARY SCIENCE TECHNOLOGY)

Mustard gas-filled 155mm projectiles are seen inside a chemical storage igloo, at the Pueblo Chemical Depot in an undated photo provided by the U.S. Army Chemical Materials Activity (CMA) in Pueblo, Colorado. The destruction of 2,600 tons of World War Two-era mustard agent weapons banned by international treaty began on March 18, 2015 at a U.S. Army depot in southern Colorado, officials said. REUTERS/U.S. Army Chemical Materials Activity/handout via Reuters (UNITED STATES - Tags: MILITARY SCIENCE TECHNOLOGY)

Muhd Zakaria (L) and Marleena Rapiee build an igloo in a park in New York February 18, 2014. The two began building the ice structure during Saturday's snowfall. REUTERS/Eric Thayer (UNITED STATES - Tags: ENVIRONMENT SOCIETY)

A worker carves ice sculptures for the igloo village on top of the mountain Nebelhorn, alpine upland, near the southern Bavarian town of Oberstdorf December 30, 2013. The Igloo village of 11 igloos which includes a bar igloo, a dining area igloo and an outside whirlpool with 40 degree hot water, is open during the winter months until April. One night costs 114 euros per person, with breakfast and cheese fondue inclusive. Picture taken December 30, 2013. REUTERS/Michaela Rehle (GERMANY - Tags: TRAVEL SOCIETY TPX IMAGES OF THE DAY)

A worker arranges reindeer furs in an igloo on top of the mountain Nebelhorn, alpine upland, near the southern Bavarian town of Oberstdorf December 30, 2013. The Igloo village of 11 igloos which includes a bar igloo, a dining area igloo and an outside whirlpool with 40 degree hot water, is open during the winter months until April. One night costs 114 euros per person, with breakfast and cheese fondue inclusive. Picture taken December 30, 2013. REUTERS/Michaela Rehle (GERMANY - Tags: TRAVEL SOCIETY)

Workers build up igloo lodges on top of the mountain Nebelhorn, alpine upland, near the southern Bavarian town of Oberstdorf December 30, 2013. The Igloo village of 11 igloos which includes a bar igloo, a dining area igloo and an outside whirlpool with 40 degree hot water, is open during the winter months until April. One night costs 114 euros per person, with breakfast and cheese fondue inclusive. Picture taken December 30, 2013. REUTERS/Michaela Rehle (GERMANY - Tags: TRAVEL SOCIETY)

Worker build up igloo lodges on top of the mountain Nebelhorn, alpine upland, near the southern Bavarian town of Oberstdorf December 30, 2013. The Igloo village of 11 igloos which includes a bar igloo, a dining area igloo and an outside whirlpool with 40 degree hot water, is open during the winter months until April. One night costs 114 euros per person, with breakfast and cheese fondue inclusive. Picture taken December 30, 2013. REUTERS/Michaela Rehle (GERMANY - Tags: TRAVEL SOCIETY)

A worker carves ice sculptures for the igloo village on top of the mountain Nebelhorn, alpine upland, near the southern Bavarian town of Oberstdorf December 30, 2013. The Igloo village of 11 igloos which includes a bar igloo, a dining area igloo and an outside whirlpool with 40 degree hot water, is open during the winter months until April. One night costs 114 euros per person, with breakfast and cheese fondue inclusive. Picture taken December 30, 2013. REUTERS/Michaela Rehle (GERMANY - Tags: TRAVEL SOCIETY)

Workers build up igloo lodges on top of the mountain Nebelhorn, alpine upland, near the southern Bavarian town of Oberstdorf December 30, 2013. The Igloo village of 11 igloos which includes a bar igloo, a dining area igloo and an outside whirlpool with 40 degree hot water, is open during the winter months until April. One night costs 114 euros per person, with breakfast and cheese fondue inclusive. Picture taken December 30, 2013. REUTERS/Michaela Rehle (GERMANY - Tags: TRAVEL SOCIETY)

Workers build up igloo lodges on top of the mountain Nebelhorn, alpine upland, near the southern Bavarian town of Oberstdorf December 30, 2013. The Igloo village of 11 igloos which includes a bar igloo, a dining area igloo and an outside whirlpool with 40 degree hot water, is open during the winter months until April. One night costs 114 euros per person, with breakfast and cheese fondue inclusive. Picture taken December 30, 2013. REUTERS/Michaela Rehle (GERMANY - Tags: TRAVEL SOCIETY)

A lavatory built on snow is pictured in the igloo village on top of the mountain Nebelhorn, alpine upland, near the southern Bavarian town of Oberstdorf December 30, 2013. The Igloo village of 11 igloos which includes a bar igloo, a dining area igloo and an outside whirlpool with 40 degree hot water, is open during the winter months until April. One night costs 114 euros per person, with breakfast and cheese fondue inclusive. Picture taken December 30, 2013. REUTERS/Michaela Rehle (GERMANY - Tags: TRAVEL SOCIETY)

Worker build up igloo lodges on top of the mountain Nebelhorn, alpine upland, near the southern Bavarian town of Oberstdorf December 30, 2013. The Igloo village of 11 igloos which includes a bar igloo, a dining area igloo and an outside whirlpool with 40 degree hot water, is open during the winter months until April. One night costs 114 euros per person, with breakfast and cheese fondue inclusive. Picture taken December 30, 2013. REUTERS/Michaela Rehle (GERMANY - Tags: TRAVEL SOCIETY)

Employees prepare the guests cheese fondue in the kitchen igloo on top of the mountain Nebelhorn, alpine upland, near the southern Bavarian town of Oberstdorf December 30, 2013. The Igloo village of 11 igloos which includes a bar igloo, a dining area igloo and an outside whirlpool with 40 degree hot water, is open during the winter months until April. One night costs 114 euros per person, with breakfast and cheese fondue inclusive. Picture taken December 30, 2013. REUTERS/Michaela Rehle (GERMANY - Tags: TRAVEL SOCIETY)

A person enters the illuminated bar igloo on top of the mountain Nebelhorn, alpine upland, near the southern Bavarian town of Oberstdorf December 30, 2013. The Igloo village of 11 igloos which includes a bar igloo, a dining area igloo and an outside whirlpool with 40 degree hot water, is open during the winter months until April. One night costs 114 euros per person, with breakfast and cheese fondue inclusive. Picture taken December 30, 2013. REUTERS/Michaela Rehle (GERMANY - Tags: TRAVEL SOCIETY)

A bar made from slabs of ice stands inside the illuminated bar igloo on top of the mountain Nebelhorn, alpine upland, near the southern Bavarian town of Oberstdorf December 30, 2013. The Igloo village of 11 igloos which includes a bar igloo, a dining area igloo and an outside whirlpool with 40 degree hot water, is open during the winter months until April. One night costs 114 euros per person, with breakfast and cheese fondue inclusive. Picture taken December 30, 2013. REUTERS/Michaela Rehle (GERMANY - Tags: TRAVEL SOCIETY)

People enjoy cheese fondue in the dining area igloo on top of the mountain Nebelhorn, alpine upland, near the southern Bavarian town of Oberstdorf December 30, 2013. The Igloo village of 11 igloos which includes a bar igloo, a dining area igloo and an outside whirlpool with 40 degree hot water, is open during the winter months until April. One night costs 114 euros per person, with breakfast and cheese fondue inclusive. Picture taken December 30, 2013. REUTERS/Michaela Rehle (GERMANY - Tags: TRAVEL SOCIETY)

Beatrice and Erwin Ritzi toast with sparkling wine in their igloo lodge on top of the mountain Nebelhorn, alpine upland, near the southern Bavarian town of Oberstdorf December 30, 2013. The Igloo village of 11 igloos which includes a bar igloo, a dining area igloo and an outside whirlpool with 40 degree hot water, is open during the winter months until April. One night costs 114 euros per person, with breakfast and cheese fondue inclusive. Picture taken December 30, 2013. REUTERS/Michaela Rehle (GERMANY - Tags: TRAVEL SOCIETY)

People enjoy a whirlpool next to their igloo lodges on top of the mountain Nebelhorn, alpine upland, near the southern Bavarian town of Oberstdorf December 30, 2013. The Igloo village of 11 igloos which includes a bar igloo, a dining area igloo and an outside whirlpool with 40 degree hot water, is open during the winter months until April. One night costs 114 euros per person, with breakfast and cheese fondue inclusive. Picture taken December 30, 2013. REUTERS/Michaela Rehle (GERMANY - Tags: TRAVEL SOCIETY)

Dimmed lights are switched on in igloos on top of the mountain Nebelhorn, alpine upland, near the southern Bavarian town of Oberstdorf December 30, 2013. The Igloo village of 11 igloos which includes a bar igloo, a dining area igloo and an outside whirlpool with 40 degree hot water, is open during the winter months until April. One night costs 114 euros per person, with breakfast and cheese fondue inclusive. Picture taken December 30, 2013. REUTERS/Michaela Rehle (GERMANY - Tags: TRAVEL SOCIETY TPX IMAGES OF THE DAY)

Warren Milne builds an igloo out of ice on his front lawn following an ice storm in Toronto, December 22, 2013. REUTERS/Mark Blinch (CANADA - Tags: ENVIRONMENT)

A man skis past an igloo polling station for the primary elections to choose the Democratic Party's leader, that is the highest polling station in Italy at 2,585m (8480 ft) above sea level on the Presena glacier, northern Italy December 8, 2013. REUTERS/Alessandro Garofalo (ITALY - Tags: POLITICS ELECTIONS ENVIRONMENT)

A man casts his vote for the primary elections to choose the Democratic Party's leader inside an igloo that is the highest polling station in Italy at 2,585m (8480 ft) above sea level on the Presena glacier, northern Italy December 8, 2013. REUTERS/Alessandro Garofalo (ITALY - Tags: POLITICS ELECTIONS ENVIRONMENT)

An igloo that is the highest polling station in Italy for the primary elections to choose the Democratic Party's leader is pictured, at 2,585m (8480 ft) above sea level on the Presena glacier, northern Italy December 8, 2013. The sentence referred to the former South Africa's leader Nelson Mandela reads, "A winner is just a dreamer who never gave up, thanks Madiba". REUTERS/Alessandro Garofalo (ITALY - Tags: POLITICS ELECTIONS ENVIRONMENT)