Yemen, Middle East: view of Dar al-Hajar (Stone House), the famous Rock Palace in Wadi Dhahr valley, a royal palace on top of a rock built as a summer retreat near the capital city of Sana'a, one of the most iconic Yemeni buildings Yemen, Middle East, 05/02/2013: view of Dar al-Hajar (Stone House), the famous Rock Palace in Wadi Dhahr valley, a royal palace on top of a rock built as a summer retreat near the capital city of Sana'a, one of the most iconic Yemeni buildings