The Sydoriv Castle (Ukrainian: Сидорівський замок, Polish: Zamek w Sidorowie) is an imposing ruin of a stronghold built by Marcin Kalinowski in Sydoriv, a village located 7 km south of Husiatyn. The castle is perched on a hilltop enclosed on three parts by a river. When built in the 1640s, the structure had 7 towers that extended for 178 metres from north to south.