Medzhybizh Castle, Ukraine

Medzhybizh Castle, when built as a bulwark against Ottoman expansion in the 1540s, was one of the strongest fortresses in Podolia. It is situated at the confluence of the Southern Bug and Buzhenka rivers, in the town of Medzhybizh, Ukraine.

The castle's founder was Mikolaj Sieniawski, and the Sieniawski family owned Medzhybizh (Polish: Międzybuż) until its extinction in the early 18th century. The stronghold was reconquered from the Turks in 1699 and passed to the Czartoryski princely family in 1731.

The last rebuilding effort was undertaken by the Russian imperial authorities in the 19th century. Much restoration has been carried out on the fortress since 1968. Within the walls are a small-scale museum and a church from 1586.