National Geographic funded the exploration and 3600 photo capturing of the world’s largest caves in Vietnam, the Hang Sơn Đoòng caves. The result was spectacular.
Official site: http://www.sondoongcave.org/
National Graphic Exploration results:
- An interactive online tour (360 pictures) : http://www.nationalgeographic.com/news-features/son-doong-cave/2/#s=pano48
- YouTube (preview) :