This castle stands on the grounds of an ancient Urartian Fortress. It was built in 1643 by Sari Suleiman, the ruler of the Mahmudi, who was subordinate to the Ottomans. Its name comes from the Hosap stream around it.

See Cavustepe Castle that is a site from the Kingdom of Urartu. The castle consists of upside and downside constructions. It was built between 764-734 BCE.

Although it is called '7 churches', it consists of 2 groups of 5 churches, library and a bell tower. The oldest one is St. Sophia Church which was built in the 8th century. The other one is the ruins of the St. John Church. These two churches are in the first group of structures. The core of the second group of structures is the Virgin Mary Church, which was built between 1003 and 1021 AD.