Spiral Staircase, Taihang Mountain
You all have must seen spiral staircases at different places, but you will be amazed to see the dangerous Spiral staircase of Taihang Mountain, China. This 300ft spiral staircase is very dangerous for kids, old people and people who have a weak heart. To reduce the risk, only people under 60 are liable to climb these stairs and you have to fill a form stating that you don’t have heart or lung problem.