A view shows the Tian Shan mountain range near Almaty, Kazakhstan February 17, 2021. Picture taken February 17, 2021. REUTERS/Pavel Mikheyev 

A tourist is seen on the Bogdanovich glacier located in the Tian Shan mountain range near Almaty, Kazakhstan February 20, 2021. Picture taken February 20, 2021. REUTERS/Pavel Mikheyev 

A tourist visits the Oktyabrskaya cave of the Bogdanovich glacier located in the Tian Shan mountain range near Almaty, Kazakhstan February 20, 2021. Picture taken February 20, 2021. REUTERS/Pavel Mikheyev TPX IMAGES OF THE DAY 

Tourists visit the Oktyabrskaya cave of the Bogdanovich glacier located in the Tian Shan mountain range near Almaty, Kazakhstan February 20, 2021. Picture taken February 20, 2021. REUTERS/Pavel Mikheyev 

A tourist visits the Oktyabrskaya cave of the Bogdanovich glacier located in the Tian Shan mountain range near Almaty, Kazakhstan February 20, 2021. Picture taken February 20, 2021. REUTERS/Pavel Mikheyev 

A tourist visits the Oktyabrskaya cave of the Bogdanovich glacier located in the Tian Shan mountain range near Almaty, Kazakhstan February 20, 2021. Picture taken February 20, 2021. REUTERS/Pavel Mikheyev 

A tourist jumps as she poses for a picture during a hike towards the Bogdanovich glacier located in the Tian Shan mountain range near Almaty, Kazakhstan February 20, 2021. Picture taken February 20, 2021. REUTERS/Pavel Mikheyev 

Tourists are seen on the Bogdanovich glacier located in the Tian Shan mountain range near Almaty, Kazakhstan February 20, 2021. Picture taken February 20, 2021. REUTERS/Pavel Mikheyev 

A tourist poses for a picture on the Bogdanovich glacier located in the Tian Shan mountain range near Almaty, Kazakhstan February 20, 2021. Picture taken February 20, 2021. REUTERS/Pavel Mikheyev TPX IMAGES OF THE DAY 

A tourist poses for a picture on the Bogdanovich glacier located in the Tian Shan mountain range near Almaty, Kazakhstan February 20, 2021. Picture taken February 20, 2021. REUTERS/Pavel Mikheyev 

Tourists take pictures during a hike towards the Bogdanovich glacier located in the Tian Shan mountain range near Almaty, Kazakhstan February 20, 2021. Picture taken February 20, 2021. REUTERS/Pavel Mikheyev 

Tourists hike towards the Bogdanovich glacier located in the Tian Shan mountain range near Almaty, Kazakhstan February 20, 2021. Picture taken February 20, 2021. REUTERS/Pavel Mikheyev 

Tourists hike towards the Bogdanovich glacier located in the Tian Shan mountain range near Almaty, Kazakhstan February 20, 2021. Picture taken February 20, 2021. REUTERS/Pavel Mikheyev 

A view shows peaks of the Tian Shan mountain range near Almaty, Kazakhstan February 17, 2021. Picture taken February 17, 2021. REUTERS/Pavel Mikheyev 

A tourist visits the Oktyabrskaya cave of the Bogdanovich glacier located in the Tian Shan mountain range near Almaty, Kazakhstan February 20, 2021. Picture taken February 20, 2021. REUTERS/Pavel Mikheyev 

Rising incongruously above the steppes of southeastern Kazakhstan is a structure as famed for the myths that surround as for the sound it produces - a single, singing dune. Located between the folds of the Tian Shan mountains near the Chinese border, the 150-metre-high by three-kilometre-long dune generates a low-pitched, organ-like rumble in dry weather. The sand hill is one of the main attractions of the Altynemel national park. The park also features volcanic mountains, millennia-old burial sites of the rulers of the Saka, an ancient nomadic tribe, and numerous wild animals including goitered gazelles known for their lightning-fast, bounding gait. REUTERS/Shamil Zhumatov SEARCH "SINGING SANDS" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY Matching text KAZAKHSTAN-PARKS/

A fire fighter ask hikers to clear the way for an ambulance to travel uphill under sub-zero temperatures at Tai Mo Shan, the highest mountain in Hong Kong, China January 24, 2016. Government radio reported on Sunday that Hong Kong Observatory said it was the coldest day in 59 years, with the temperature dropping to 3.3 degrees in urban areas. REUTERS/Bobby Yip 

A fire fighter helps a hiker on icy gound under sub-zero temperatures at Tai Mo Shan, the highest mountain in Hong Kong, China January 24, 2016. Government radio reported on Sunday that Hong Kong Observatory said it was the coldest day in 59 years, with the temperature dropping to 3.3 degrees in urban areas. REUTERS/Bobby Yip 

Steam fills the glasses of a hiker under sub-zero temperatures at Tai Mo Shan, the highest mountain in Hong Kong, China January 24, 2016. Government radio reported on Sunday that Hong Kong Observatory said it was the coldest day in 59 years, with the temperature dropping to 3.3 degrees in urban areas. REUTERS/Bobby Yip 

A hiker walks past icy plants under sub-zero temperatures at Tai Mo Shan, the highest mountain in Hong Kong, China January 24, 2016. Government radio reported on Sunday that Hong Kong Observatory said it was the coldest day in 59 years, with the temperature dropping to 3.3 degrees in urban areas. REUTERS/Bobby Yip TPX IMAGES OF THE DAY

A hiker walks uphill on icy grass under sub-zero temperatures at Tai Mo Shan, the highest mountain in Hong Kong, China January 24, 2016. Government radio reported on Sunday that Hong Kong Observatory said it was the coldest day in 59 years, with the temperature dropping to 3.3 degrees in urban areas. REUTERS/Bobby Yip 

Hikers rest beside icy trees under sub-zero temperatures at Tai Mo Shan, the highest mountain in Hong Kong, China January 24, 2016. Government radio reported on Sunday that Hong Kong Observatory said it was the coldest day in 59 years, with the temperature dropping to 3.3 degrees in urban areas. REUTERS/Bobby Yip 

Hikers walk behind icy plants under sub-zero temperatures at Tai Mo Shan, the highest mountain in Hong Kong, China January 24, 2016. Government radio reported on Sunday that Hong Kong Observatory said it was the coldest day in 59 years, with the temperature dropping to 3.3 degrees in urban areas. REUTERS/Bobby Yip 

Ice is seen on a car under sub-zero degrees Celsius at Tai Mo Shan, the highest mountain in Hong Kong, China January 24, 2016. Government radio reported on Sunday that Hong Kong Observatory said it was the coldest day in 59 years, with the temperature dropping to 3.3 degrees in urban areas. REUTERS/Bobby Yip 

Hikers are covered with ice under sub-zero temperatures at Tai Mo Shan, the highest mountain in Hong Kong, China January 24, 2016. Government radio reported on Sunday that Hong Kong Observatory said it was the coldest day in 59 years, with the temperature dropping to 3.3 degrees in urban areas. REUTERS/Bobby Yip TPX IMAGES OF THE DAY

A hiker poses with a thermometer under sub-zero temperatures at Tai Mo Shan, the highest mountain in Hong Kong, China January 24, 2016. Government radio reported on Sunday that Hong Kong Observatory said it was the coldest day in 59 years, with the temperature dropping to 3.3 degrees in urban areas. REUTERS/Bobby Yip 

Ice is seen at the back of a car under sub-zero temperatures at Tai Mo Shan, the highest mountain in Hong Kong, China January 24, 2016. Government radio reported on Sunday that Hong Kong Observatory said it was the coldest day in 59 years, with the temperature dropping to 3.3 degrees in urban areas. REUTERS/Bobby Yip 

Cable cars are pictured against the backdrop of the Tien Shan mountains near the Medeu skating oval in Almaty, Kazakhstan, July 26, 2015. Kazakhstan is aspiring to host the 2022 Winter Olympics but many in the Central Asian nation view the bid as yet another vanity project of long-ruling President Nursultan Nazarbayev. Almaty, the financial capital, will go head-to-head with the Chinese metropolis Beijing on Friday when the International Olympic Committee elects the winner at its session in Malaysia. Picture taken July 26, 2015. REUTERS/Shamil Zhumatov

A man rides a horse against the backdrop of the Tien Shan mountains near the Medeu skating oval in Almaty, Kazakhstan, July 26, 2015. Kazakhstan is aspiring to host the 2022 Winter Olympics but many in the Central Asian nation view the bid as yet another vanity project of long-ruling President Nursultan Nazarbayev. Almaty, the financial capital, will go head-to-head with the Chinese metropolis Beijing on Friday when the International Olympic Committee elects the winner at its session in Malaysia. Picture taken July 26, 2015. REUTERS/Shamil Zhumatov

Russian and Kyrgyz national flags fly from the 4446m (14,586 feet) high Vladimir Putin Peak in the Tian Shan mountains, some 100km (62 miles) south of the Kyrgyz capital Bishkek, September 17, 2012. The peak was named in 2011 in honour of Russian President Vladimir Putin, who is due to visit Kyrgyzstan on Thursday. REUTERS/Vladimir Pirogov (KYRGYZSTAN - Tags: POLITICS) 

An alpinist prepares to climb the 4446m (14,586 feet) high Vladimir Putin Peak (C) in the Tian Shan mountains some 100km (62 miles) south of the Kyrgyz capital Bishkek September 17, 2012. The peak was named in 2011 in honour of Russian President Vladimir Putin, who is due to visit Kyrgyzstan on Thursday. REUTERS/Vladimir Pirogov (KYRGYZSTAN - Tags: POLITICS ENVIRONMENT) 

The 4446m (14,586 feet) high Vladimir Putin Peak (L) is seen from the cockpit of a helicopter as it flies in the Tian Shan mountains some 100km (62 miles) south of the Kyrgyz capital Bishkek September 17, 2012. The peak was named in 2011 in honour of Russian President Vladimir Putin, who is due to visit Kyrgyzstan on Thursday. REUTERS/Vladimir Pirogov (KYRGYZSTAN - Tags: POLITICS ENVIRONMENT) 

The 4446m (14,586 feet) high Vladimir Putin Peak is reflected in the porthole of a helicopter in the Tian Shan mountains some 100km (62 miles) south of the Kyrgyz capital Bishkek September 17, 2012. The peak was named in 2011 in honour of Russian President Vladimir Putin, who is due to visit Kyrgyzstan on Thursday. REUTERS/Vladimir Pirogov (KYRGYZSTAN - Tags: POLITICS ENVIRONMENT) 

Russian and Kyrgyz national flags fly from the 4446m (14,586 feet) high Vladimir Putin Peak in the Tian Shan mountains, some 100km (62 miles) south of the Kyrgyz capital Bishkek, September 17, 2012. The peak was named in 2011 in honour of Russian President Vladimir Putin, who is due to visit Kyrgyzstan on Thursday. REUTERS/Vladimir Pirogov (KYRGYZSTAN - Tags: POLITICS) 

Russian and Kyrgyz national flags fly from the 4446m (14,586 feet) high Vladimir Putin Peak in the Tian Shan mountains, some 100km (62 miles) south of the Kyrgyz capital Bishkek, September 17, 2012. The peak was named in 2011 in honour of Russian President Vladimir Putin, who is due to visit Kyrgyzstan on Thursday. REUTERS/Vladimir Pirogov (KYRGYZSTAN - Tags: POLITICS) 

A group of alpinists climb the 4446m (14,586 feet) high Vladimir Putin Peak in the Tian Shan mountains, some 100km (62 miles) south of the Kyrgyz capital Bishkek, September 17, 2012. The peak was named in 2011 in honour of Russian President Vladimir Putin, who is due to visit Kyrgyzstan on Thursday. REUTERS/Vladimir Pirogov (KYRGYZSTAN - Tags: POLITICS ENVIRONMENT) 

Russian and Kyrgyz national flags fly from the 4446m (14, 586 feet) high Vladimir Putin Peak in the Tian Shan mountains, some 100km (62 miles) south of the Kyrgyz capital Bishkek, September 17, 2012. The peak was named in 2011 in honour of Russian President Vladimir Putin, who is due to visit Kyrgyzstan on Thursday. REUTERS/Vladimir Pirogov (KYRGYZSTAN - Tags: POLITICS) 

Li Guirong, a cardiology professor at the University of Hong Kong, speaks during an interview in Hong Kong December 16, 2011. Chinese legends have long extolled the benefits of the Tian Shan Xue Lian, a rare white flower found in snowcapped mountains that is revered as a panacea, an elixir that can supposedly bring the dead back to life. Picture taken December 16, 2011. To match Feature DRUGS-CHINA/TCM
REUTERS/Tyrone Siu (CHINA - Tags: HEALTH SOCIETY) 

Li Guirong, a cardiology professor at the University of Hong Kong, poses for photos after an interview in Hong Kong December 16, 2011. Chinese legends have long extolled the benefits of the Tian Shan Xue Lian, a rare white flower found in snowcapped mountains that is revered as a panacea, an elixir that can supposedly bring the dead back to life. Picture taken December 16, 2011. To match Feature DRUGS-CHINA/TCM
REUTERS/Tyrone Siu (CHINA - Tags: HEALTH SOCIETY) 

A flower called "Tian Shan Xue Lian" is seen in this illustration photo in Hong Kong December 20, 2011. Chinese legends have long extolled the benefits of the Tian Shan Xue Lian, a rare white flower found in snowcapped mountains that is revered as a panacea, an elixir that can supposedly bring the dead back to life. Picture taken December 20, 2011. To match Feature DRUGS-CHINA/TCM
REUTERS/Tyrone Siu (CHINA - Tags: HEALTH SOCIETY) 

A flower called "Tian Shan Xue Lian" is seen in this illustration photo in Hong Kong December 20, 2011. Chinese legends have long extolled the benefits of the Tian Shan Xue Lian, a rare white flower found in snowcapped mountains that is revered as a panacea, an elixir that can supposedly bring the dead back to life. Picture taken December 20, 2011. To match Feature DRUGS-CHINA/TCM
REUTERS/Tyrone Siu (CHINA - Tags: HEALTH SOCIETY) 

A flower called "Tian Shan Xue Lian" is seen in this illustration photo in Hong Kong December 20, 2011. Chinese legends have long extolled the benefits of the Tian Shan Xue Lian, a rare white flower found in snowcapped mountains that is revered as a panacea, an elixir that can supposedly bring the dead back to life. Picture taken December 20, 2011. To match Feature DRUGS-CHINA/TCM
REUTERS/Tyrone Siu (CHINA - Tags: HEALTH SOCIETY) 

A flower called "Tian Shan Xue Lian" is seen in this illustration photo in Hong Kong December 20, 2011. Chinese legends have long extolled the benefits of the Tian Shan Xue Lian, a rare white flower found in snowcapped mountains that is revered as a panacea, an elixir that can supposedly bring the dead back to life. Picture taken December 20, 2011. To match Feature DRUGS-CHINA/TCM
REUTERS/Tyrone Siu (CHINA - Tags: HEALTH SOCIETY) 

A flower called "Tian Shan Xue Lian" is seen in this illustration photo in Hong Kong December 20, 2011. Chinese legends have long extolled the benefits of the Tian Shan Xue Lian, a rare white flower found in snowcapped mountains that is revered as a panacea, an elixir that can supposedly bring the dead back to life. Picture taken December 20, 2011. To match Feature DRUGS-CHINA/TCM
REUTERS/Tyrone Siu (CHINA - Tags: HEALTH SOCIETY) 

A horse stands next to the three wheeled motorised taxi called 'tuk-tuk', belonging to two British women, Jo Huxster and Antonia Bolingbroke-Kent in the Tien Shan mountains outside Almaty, July 15, 2006. Huxster and Bolingbroke-Kent's 12,000-mile journey started from Bangkok in May, and is expected to end three months later in the English town of Brighton. REUTERS/Shamil Zhumatov (KAZAKHSTAN) 

Horses graze on the snow-covered foothills of Tien Shan mountains near the village of Cheyek some 200 km (124 miles) south of the capital Bishkek in Kyrgyzstan February 4, 2006. Picture taken February 4, 2006. REUTERS/Shamil Zhumatov Also see image GF2DVWTXAZAA 

A Kyrgyz man rides with a herd of horses near the village of Cheyek in the Tien Shan mountains some 200 km (124 miles) south of the capital Bishkek February 4, 2006. Picture taken February 4, 2006. REUTERS/Vladimir Pirogov