Qirmizi Gunbad (Faː گنبد سرخ)

The grave for Halgu Khan (first ruler of Ilkhanid Dynasty) built in 13th century.

An institutionalized astronomical observatory which was established in 1259 CE under the patronage of the Ilkhanid Hulagu and the directorship of Nasir al-Din al-Tusi, a Persian scientist and astronomer. In the heights west of Maragheh, East Azerbaijan Province, Iran, it was once considered one of the most prestigious observatories in the world.