Explore the ancient caves of Hang Son Doong, Vietnam. Hang Son Doong is one of the largest caves in the world and features a fast-flowing underground river. For spelunkers, exploring Hang Son Doong is the equivalent of scaling Mount Everest.
Kjeragbolten – Kjerag boulder is wedged into a mountain crevasse in west Norway along the Lysefjord. Because Preikestolen is so crowded, Kjerag has become a popular hiking and climbing destination. You don’t need equipment to walk out onto the rock,.
the Dar al-Hajar (Rock Palace) perched atop a rock pinnacle at the Wadi Dhahr Valley in Yemen. Classic example of Yemeni architecture built in 1786 by Imam Mansour Ali Bin Mahdi Abbas; in the Imam Yahya Hamid Al Din extended it as a summer residence.