Watford, just north of London, is best known on screen for Warner Bros. Studios Leavesden - the permanent home of Harry Potter and the base for films from Star Wars to The Dark Knight. 85 titles in our database map to the area, including Band of Brothers, The Crown and Downton Abbey.
Unusually for a studio town, there's a real attraction here: the Warner Bros. Studio Tour London - The Making of Harry Potter - lets you walk the actual sets, from the Great Hall to Diagon Alley. It's one of the most rewarding film pilgrimages in Britain, and the map shows what was made in the area.