Muzeum Ziemi PAN (Earth Museum, Polish Academy of Sciences)

Unrelated to the one above.

Sejm is the name for the lower chamber of the Polish parliament, which since the 1930s meets in a peculiar circus-shaped building. The upper chamber, named Senat, occupies a rectangular building behind it. They are surrounded by a nice park.

The museum (really an art gallery) has a wonderful collection of paintings, sculptures, and depictions of the passion of the Christ. It houses several of Poland's most known paintings. Jan Matejko's Stańczyk painting depicts a famous jester to the Polish royalty in despair after Lithuania lost the city of Smolensk to Russia in 1514. The highlight is a gallery devoted to 1961–1964 excavations from Faras (previously Pachoras), modern Sudan.

An artistic installation of an artificial palm tree (made of plastic and preserved imported palm tree leaves, periodically replaced), it was inspired by the artist's visit to Israel and the fact that Aleje Jerozolimskie, where it is placed, is named after New Jerusalem, a large pre-war Jewish settlement in Warsaw that does not exist anymore. It started as a very controversial landmark on one of the city's busiest roundabouts, and grew to become a much-loved fixture. It is probably the only palm tree in the world that had its own website.