Dumfries Aviation Museum is located on the site of the former RAF Dumfries, on the outskirts of Dumfries. It's a small museum run by a dedicated team of volunteers. They have an eclectic collection of aircraft, most of which need some renovation, with displays about the airfield, airborne forces, engines and equipment.
The star attraction is the Loch Doon Spitfire. This is a Mark II Spitfire that fought in the Battle of Britain. It was then sent to Scotland as a training aircraft for a Czech squadron, and it crashed in Loch Doon on a training flight. Volunteer divers found the aircraft, which had been restored at the museum.
Outside they have an interesting collection of Cold War aircraft. Starting in the car park with the English Electric Lighting. Perhaps not the most elegant jet fighter, but I had the Airfix kit hanging from my bedroom ceiling as a kid.