The interior decoration features salvaged works of art and elements of furnishings from the old Castle. Worth seeing are also Rembrandt's paintings.
Worth seeing are the Great and the Royal Suite with the Great, the Throne and Canaletto Halls (featuring 22 original paintings by Bernard Belloto called Canaletto), the Senators Hall, in which the Constitution of May 3 passed in 1791 is exhibited, along with Rembrandt's paintings "Girl in the Picture Frame" and "Scholar at the Desk”.
The Kubicki Arcades (Arkady Kubickiego) exhibit archaeological objects and manor lodgings. The Pod Blachą Palace (Pałac pod Blachą) presents a unique collection of eastern rugs from the Teresa Sahakian Foundation collection.