Spiral staircase
Taihang Mountains

... at the boundary between the provinces of Shanxi and Henan, China.

This spiral staircase of almost 100 meters has been installed recently in an attempt to attract thousands of tourists each year to the beautiful Taihang Mountains.

Before undertaking the ascent visitors are asked to sign forms to ensure they do not have heart or lung problems, and are under age 60. A slip off a narrow metal ladder  can lead to heaven, as in a song of Led Zeppelin.