The Sejm building is a semi-round building located at Wiejska Street. It houses the amphitheatre hall, where sessions of the Sejm of Poland take place. The Sejm is the lower house (460 seats) of the Polish Parliament, while the upper house (100 seats) is called Senat (Senate). The building was completed in 1928, damaged during WWII and restored after the war. On the rotunda building there are reliefs, which symbolise various virtues. The Sejm gallery is open to the public during the sessions.