Firozkoh (Persian: فیروزکوه, Fīrōzkōh), or Turquoise Mountain, was the summer capital of the Ghurid dynasty, in the Ghor Province of central Afghanistan. It was reputedly one of the greatest cities of its age, but was destroyed in 1223 after a siege by Tolui, son of Genghis Khan. The location of the city was lost to history.