The Odescalchi Manor is a two-floor building with three wings and a U-shaped ground plan. It was built by Ilok nobles at the end of the 15th century as a fortified city citadel with an inner courtyard. It had the architectural features of the transition from the Gothic to the Renaissance style. Later, the building was redone in a style blending Baroque and Classicism. The Odescalchi Manor and its surroundings are one of the most remarkable sites in Ilok.