Photo: Louise Ireland, CC BY-SA 2.0 Free viewpoints in London
Photo: Louise Ireland, CC BY-SA 2.0 Sky Garden
Free at certain times
Photo: Mx. Granger, CC0 Greenwich Park
Free outside, paid inside
Photo: Dudley Miles, CC BY-SA 3.0 Hampstead Heath
Free, always
Photo: Diliff, CC BY 2.5 South Bank riverside walk
Free, always
Photo: M R Karim Reza, CC BY-SA 4.0 Horizon 22
Free at certain timesThe Garden at 120
Free, always
Photo: Tom Morris, CC BY-SA 3.0 One New Change roof terrace
Free, alwaysAlexandra Palace
Free, always
Photo: Ibex73, CC BY-SA 4.0 Millennium Bridge
Free, always
Photo: Mark Hogan from London, UK, USA, CC BY-SA 2.0