Wellington Arch London, also known as Constitution Arch was originally conceived as the gateway to Buckingham Palace but ended up being erected at Hyde Park Corner. You can visit the Wellington Rooms and their great advantage point to see the surrounding area and the Horse Guards pass through the arch every day.
The Parkland Walk Closest station: Finsbury Park Budget: Free entry “The Parkland Walk runs from Finsbury Park, through Crouch End and up to Highgate. It’s an abandoned railway line that’s become a forest. Look out for the adult sized playground apparatus too!” – lucyk6