Firozkoh
Ghurid Empire
Firozkoh (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. It has been proposed that the Minaret of Jam, in Shahrak District, Ghor Province, is the only standing remains of the city.
Archaeological site data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).