Sejm and Senate Complex of Poland, Parliament complex in Śródmieście, Poland

The Sejm and Senate Complex of Poland occupies a government block on Wiejska Street in Warsaw. Its oldest part is the former Alexandrian-Mary Institute, a five-storey cream building with a triangular pediment; it connects to lower white wings and a block with a green-edged roof and columns. Behind the centre stands a ribbed grey dome with a cupola and flagpole. Inside, a white stone spiral staircase coils more than one full turn through a circular hall, with a dark scrolled metal balustrade and a light wood handrail.

In 1918 Poland adapted the former Alexandrian-Mary Institute girls' school on Wiejska Street for parliament; the Legislative Sejm first met there on 10 February 1919 and adopted the March Constitution in 1921. The new Sejm Meeting Hall, designed by Kazimierz Skórewicz, was inaugurated on 27 March 1928. Rebuilt after wartime destruction, the complex was expanded by Bohdan Pniewski from 1948 to 1952.

The name refers to the two chambers of the Polish parliament, which have met here for decades to conduct legislative work. The halls are fitted with wood and marble, while reliefs on the walls depict different professional groups.

Access is possible only as part of an official guided tour, which can be booked in advance through the parliament website. The visit includes the plenary halls and some reception rooms, with routes designed to be accessible.

Below street level are several tunnel passages that connect the different building sections with each other and also provide an underground access road to the main entrance. This hidden infrastructure was created to facilitate the flow of parliamentary work and protect from weather conditions.