London
•The cinema where each of the Harry Potter films has had its world premiere
•The cafe attack (The Deathly Hallows Part 1)
•The Seven Potters Battle in the London sky (The Deathly Hallows Part 1)
•The thoroughfare on which Diagon Alley was based.
•The magical platform 9¾ sign where Harry catches the Hogwart's Express.
•The bridge destroyed by Lord Voldemort's Death Eaters (Half-Blood Prince).
•The bridge where the Knight Bus squeezes between two London Double Decker buses (Prisoner of Azkaban).
•The entrance to the Leaky Cauldron that Harry and Hagrid entered on their way to Diagon Alley (Sorcerers Stone / Philosophers Stone).
•The entrance to the Leaky Cauldron where the Knight Bus dropped Harry off (Prisoner of Azkaban).
•The location of the red telephone box where Harry and Mr Weasley descend into the secret Ministry of Magic (Order of the Phoenix).
•The secret hideout where Harry is reunited with Sirius Black (Order of the Phoenix)
Outside London
•Black Park in royal Buckinghamshire, aka the Forbidden Forest, where you'll also find the location for Hogsmeade Station, and where he who cannot be named drank the blood of a unicorn.
•No 4 Privet Drive, Little Whingeing, Surrey. There are actually 2 film locations!
•Virgina Water, Surrey, where a lakeside task for the triwizard tournament must be completed
•Bourne Woods in Surrey, where forest scenes from The Half Blood Prince and The Deathly Hallows Part 1 were filmed
•Leavesdon Studios, recently acquired by Warner Bros., the home of Harry Potter on the silver screen