Photo: N-Lange.de, CC BY-SA 3.0 Free walks & trails in Berlin
Photo: N-Lange.de, CC BY-SA 3.0 
Photo: Arne Müseler, CC BY-SA 3.0 de Hackesche Höfe
Free, always
Photo: Coooohen, CC BY-SA 4.0 Tempelhofer Feld
Free, always
Photo: Lienhard Schulz, CC BY-SA 3.0 Landwehr Canal
Free, always
Photo: Fernando Pascullo, CC BY-SA 4.0 Nikolaiviertel
Free, always
Photo: Original version: Nath el Biya/Niels, CC BY-SA 2.0 Unter den Linden
Free, always
Photo: Lienhard Schulz, CC BY-SA 3.0 Grunewald Forest
Free, alwaysSchlachtensee
Free, always
Photo: A.Savin, CC BY-SA 3.0