At the turn of the 1960s and the 1970s the project of a new north wing of the museum was designed by architect Marian Trzaska.

In the 1990s it was adapted by interior designer Witold Gyurkovich and opened to the public in 2001.

[2] In 2006, the collections of the museum included 309 569 art objects in total as well as 4119 deposits.

The works of many prominent Polish artists are displayed in the Gallery of Polish Art, which includes paintings by Jan Matejko, Olga Boznańska, Jacek Malczewski, Stanisław Wyspiański, Leon Wyczółkowski, and Władysław Czachórski.

The main building features one of the largest galleries of foreign painting in Poland, predominantly originating from the collection owned by Count Raczyński: