A hotel staff walks as he guides visitors inside a bomb shelter under the garden of the Metropole hotel in Hanoi May 21, 2012. The Metropole hotel opened for visitors the underground bomb shelter that used to be functional from 1965 to 1975 during the Vietnam war. U.S. folk singer Joan Baez and actress Jane Fonda, foreign war correspondents and foreign diplomats took shelter in it during the Christmas Bombings in 1972 as well as other bombings during the Vietnam war. REUTERS/Kham (VIETNAM - Tags: TRAVEL SOCIETY)