Zachęta is one of the oldest showrooms in Poland. The impressive building was built between 1898-1900 and designed by Stefan Szyller. All the most outstanding Polish artists’ presented their works in Zachęta, including Wojciech Gerson, Jan Matejko, Józef Chełmoński, Józef Brandt, Stanisław Wyspiański, Józef Mehoffer and many others.
http://www.warsawtour.pl/en/tourist-attractions/zach-ta-national-gallery-of-art-zach-ta-narodowa-galeria-sztuki-2439.html