The Chinese Villages Inside the World's Largest Caves - Carsten Peter

Some of the world's largest caves are dark, found far away from accessible entrances. Once inside, the caves are over 600 feet from floor to ceiling and big enough to host entire villages that have built roofless homes. National Geographic photographer Carsten Peter explains that the Chinese government is hoping to develop the caves, by building glass elevators deep into the caves to provide access for tourists.