Alamut Castle

Alamut is a ruined mountain fortress located in the Alamut region in the South Caspian, near the village of Gazor Khan in Qazvin Province in Iran, approximately 200 km from present-day Tehran.: 22–23 

In 1090 AD, the Alamut Castle, a mountain fortress in present-day Iran, came into the possession of Hassan-i Sabbah, a champion of the Nizari Ismaili cause. Until 1256, Alamut functioned as the headquarters of the Nizari Ismaili state, which included a series of strategic strongholds scattered throughout Persia and Syria, with each stronghold being surrounded by swathes of hostile territory.

Alamut, which is the most famous of these strongholds, was thought impregnable to any military attack and was fabled for its heavenly gardens, library, and laboratories where philosophers, scientists, and…

Source: Wikipedia