Glass walkway 4,000ft above a rocky ravine November 12, 2011 The glass path that was built of the side of a cliff 4,700ft above sea level on Tianmen Mountain in Zhangjiajie, China. Read more
The Tallest Rock Climbing Wall in the World November 12, 2011 in Groningen, Holland, this climbing wall is considered the tallest in the world. Photos courtesy of Eric Kieboom. Read more