The Tiergarten park in Mitte, with landscape design by Peter Joseph Lenné, is one of Berlin's largest and most popular parks. In Kreuzberg, the Viktoriapark provides a viewing point over the southern part of inner-city Berlin. Treptower Park, beside the Spree in Treptow, features a large Soviet War Memorial. The Volkspark in Friedrichshain, which opened in 1848, is the oldest park in the city, with monuments, a summer outdoor cinema and several sports areas. Tempelhofer Feld, the site of the former city airport, is the world's largest inner-city open space.