Kamianets-Podilskyi Castle, Medieval fortress in Kamianets-Podilskyi, Ukraine.

Kamianets-Podilskyi Castle stands on a rocky island in a loop of the Smotrych River, reached by a narrow strip of rock carrying the Castle Bridge. Its Old Castle is an irregular quadrangle about 50 m wide and 135–180 m long, enclosed by high walls with 11 stone towers, among them the Papal Tower and the Black Tower. Beyond it lie the earthen ramparts and moats of the New Castle, built in the early 17th century.

Ruthenian and Lithuanian rulers began building the complex in the 14th century to protect the trade route along the river. Later Polish owners reinforced the walls and added new towers when Ottoman armies threatened the region.

The castle stands where the Smotrych River loops around a high rock, and the narrow ridge linking it to the town carries the Castle Bridge. The bridge was long called the "Turkish bridge" after the Ottoman capture of Kamianets in 1672. The fortress has belonged to the Kamianets-Podilskyi State Historical Museum-Reserve since 1937 and is listed among the "Seven Wonders of Ukraine."

The castle stands on a rocky spur enclosed by a loop of the Smotrych River, reached from the city across the Castle Bridge over a narrow rock isthmus. The entrance is on the east side, from the town. The site has two parts: the walled Old Castle with its eleven towers and the earthen New Castle with ramparts and moats, partly preserved.

Each of the eleven towers carries its own name, reflecting either its former function or the family that funded it. The different heights and shapes of the towers show how military engineering changed over the centuries.