People visit Dar al-Hajar (Rock Palace) perched atop a rock pinnacle at the Wadi Dhahr valley, north of Sanaa, Yemen, on Sept. 26, 2016. (Xinhua/Hani Ali)
People visit Dar al-Hajar (Rock Palace) perched atop a rock pinnacle at the Wadi Dhahr valley, north of Sanaa, Yemen, on Sept. 26, 2016. (Xinhua/Hani Ali)