The Międzyrzecz Museum Complex includes the ruins of a 14th Century castle from the reign of King Casimir III the Great, the 18th Century starosty building, the 18th Century mansion outbuilding, as well as the gatehouse and the mansion inn. The museum exhibition displays coffin portraits, portrait paintings, everyday items used in agriculture, fishing, hunting and various crafts, as well as folk costumes and instruments. Open year-round.