It is the Khotyn fortress.
G. Khotin, Ukraine, my hometown. I love my country.
Khotyn Fortress
The Khotyn Fortress (Ukrainian: Хотинська фортеця, Polish: twierdza w Chocimiu, Turkish: Hotin Kalesi, Romanian: Cetatea Hotinului) is a fortification complex located on the right bank of the Dniester River in Khotyn, Chernivtsi Oblast (province) of western Ukraine. It is situated on a territory of the historical northern Bessarabia region which was split in 1940 between Ukraine and Moldova. The fortress is also located in a close proximity to another famous defensive structure, the Old Kam'yanets Castle of Kamianets-Podilskyi.
Construction on the current Khotyn fortress was started in 1325, while major improvements were made in the 1380s and in the 1460s.
The fortress is a large tourist attraction for the area and Ukraine. In 2007, the fortress was named one of the Seven Wonders of Ukraine.[3] It is also a National Ukrainian Architectural Preserve as of 2000.[4]
Source: Wikipedia