RAF MUSEUM, London
The Royal Air Force Museum is on the site of the historic Hendon aerodrome, just over 30 minutes from central London. If you like aircraft, you will love it. There are entire hangers dedicated to WW1 aircraft, bombers of all sorts and the Battle of Britain, plus a lot more besides - including flight simulators. Be awed by the Avro Vulcan or Lancaster, or wonder how the flimsy aircraft of the early days managed to stay up.
There is a sister museum in Cosford, Shropshire.