Alnwick Castle, Northumberland (Hogwarts, outside scenes)
Bodleian Library, Oxford (Hogwarts, interior)
Glenfinnan Viaduct, Scotland (Hogwarts Express Railway)
Goathland Railway Station, North Yorkshire (Hogsmeade Railway Station)
Loch Eilt, Scotland (Hogwards, grounds)
Lacock Abbey, Wiltshire (Hogwarts, interiors)
Martins Heron, Berkshire (Privet Drive, Little Whinging)
There are many more locations of course; Platform 9 3/4, Gringott's Bank, the Forbidden Forest, Diagon Ally, various classrooms, outdoor and lakeside scenes etc. etc. but their inclusion would require less laziness on my part... and maybe... a TV show? Maybe a TV show that follows locations from young adult fiction novel favorites???