This is perhaps the striking and controversial of all Trabzon ’s buildings. In the illustration in the Yildiz Palace Albums it has been daded H. 1305 and the monogram of Abdülhamit II and inscription corroborate this assumption. Thus, its construction date can be definitely confirmed as 1887.

This structure comprises to circular buildings one inside the other, the radius of one being 25m. and other, 40m. The inner structure is fuor storeyed and outer, thee storeyed. Both the inner and outer structures have 13 windows surmounted by oval arches. The whole is surrounded by a high protective wall and there is a guardroom on its west side. During the Russian invasion of 1916-1918 it was used as an Arsenal and the roof was blown off by an explosion which took place on 9 July, 1919 .