Memento Park is an open air museum in Budapest, dedicated to monumental statues from Communist period in Hungary (1949 - 1989).
There are statues of Lenin, Marx, and Engels, and several Hungarian Communist leaders. The park was designed by Hungarian architect, Ákos Eleod, who won the competition announced by the Budapest General Assembly in 1991.
It's a little bit of a trek from the city centre, but worth the effort to get an idea of life in communist era Hungary.