Parades Square
Warsaw, Poland · built 1955
Parade Square (Plac Defilad) is a square in downtown Warsaw, laying between Świętokrzyska Street to the north, Aleje Jerozolimskie to the south, Marszałkowska Street to the east and the monumental Palace of Culture and Science to the west. With 147,000 m2 (1, 580, 000 sq ft) of extension, it is the largest city square in Europe and one of the largest in the world.
Square data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).