WulongTiansheng Three Bridges is a Unesco World Heritage Site located about 20km away from Wulong County and a filmmaking location for the films “Curse of the Golden Flower” and “Transformers 4”. It is a precious eco-system site which is famous for the karst topography expecially the Tiankeng or natural sinkhole in the world. The site has three stone arch bridges that are deemed as " natural arch bridges in the world". They are namely Tianlong(Sky Dragon) Bridge, Qinglong (Green Dragon) Bridge, and Heilong (Black Dragon) Bridge. It is the largest natural stone bridge group in Asia.