Photo: Tonchino, CC BY-SA 3.0 Free viewpoints in Paris
Photo: Tonchino, CC BY-SA 3.0 
Photo: ZeusUpsistos, CC BY-SA 4.0 Arc de Triomphe
Free at certain times
Photo: Clem from Paris, France, CC BY-SA 2.0 Parc des Buttes-Chaumont
Free, always
Photo: Ibex73, CC BY-SA 4.0 Trocadéro Gardens
Free, alwaysGaleries Lafayette rooftop
Free, always
Photo: Chabe01, CC BY-SA 4.0 Parc de Belleville
Free, alwaysBerges de Seine
Free, alwaysInstitut du monde arabe terrace
Free, always
Photo: Pierre Blaché from Paris, France, CC0