Alamut Castle

Alamut Castle clings to a narrow rock ridge in Iran's Qazvin Province, roughly 100 kilometers northwest of Tehran at around 2,100 meters elevation. From 1090 to 1256 it served as the headquarters of Hassan-i Sabbah and the Nizari Ismaili order — the group medieval Europeans called the Assassins — a secretive political-religious movement that wielded influence across the Islamic world through strategic targeted killings and an elaborate network of mountain strongholds. The fortress fell in 1256 to Hülegü Khan's Mongol forces, who reportedly destroyed its legendary library, one of the great repositories of medieval Islamic scholarship. Only ruined walls and foundations remain today, but the hours-long hike to the summit rewards visitors with sweeping views over the Alamut valley and the Alborz mountains beyond.