The Smithsonian in Washington DC has a fantastic specialist air and space museum in town as well as an equally good new satellite museum nearby in Chantilly, Virginia. The new one the result of a donation of over USD90million from a benefactor who was successful in regional air transportation.
The museum at Caloundra is also worth a visit
QAM, Queensland Air Museum – Queensland's Greatest Collection of Aviation History
You need to also look at the RAAF Museum at Point Cook.Do you mean Udvar Hazy or another brand new one?
Some of my favourites I have visited are -
Smithsonian Air and Space and Udvar Hazy in Washington DC - most famous planes/rockets ever flown
Intrepid Aircraft Carrier in New York - carrier type planes, concorde and space shuttle
Both NASA's - rockets
Ellsworth AFB South Dakota, B52's, B1 Bombers and Nuke missile silos nearby as well.
Pearl Harbour - Hawaii
Yorktown Aircraft Carrier - like Intrepid, not as well kept but can wander anywhere
Duxford - UK planes, have flown into here on a light plane, the new American plane wing is now open again
Hendon - like Duxford older mainly UK planes
Yorkshire Aviation Museum is still set up like a WW2 bomber base, intact Halifax Bomber you can go inside
East Kirkby - Functioning Lancaster Bomber, taxi rides only - not flying
RAF Scampton - Dambusters Museum, Red Arrows...though I think they were moving?
RAF Cosford - excess planes from other museums
RNAS Yeovilton - UK naval aviation
Many ex WW2 stations have some remains or museums and light aircraft runways
in France many D-Day museums have aviation bits
Royal Military Museum - Brussels all Forces but a large old plane section
National Military Museum - old Soesterberg Air Base - Netherlands, all forces but pretty new
Kbely Aviation Museum - Prague lots older cold war ex Soviet planes and helicopters
Imperial War Museum Canberra
Most current RAAF bases have Museums in each state some on site some separate.
Have been to Pearce, Amberley, Pt Cook, Wagga, Adelaide, Townsville, Newcastle/Williamstown
Former WW2 bases such as Nhill, and Evans Head have started small museums as well.
Nowra Naval Museum has some planes
Temora Aviation Museum
Qantas at Longreach
HARS at Woolongong
Queensland Air Museum at Caloundra - large collection, lots outside
Small one at Caboolture as well if you are bored...
Oakey Army Aviation Museum
Woomera - Rockets
I offered to start and run their Huey at Bullcreek but they wouldn't let me! (It’s only about 30 years since I ran one)Just to add to @jastel ’s list:
There is a good little museum at the Aviation Heritage Museum in Bullcreek, WA with a Catalina Flying boat, Dakota C-47, Vampire, Tiger Moth etc and you can take a Avro Lancaster tour @ $125 pp - ouch !
Both sites doing an excellent job and staffed by volunteers.
I find the Planes of Fame museum to be a great place to visit.Planes of Fame at Chino (CA) is well worth a visit. a LOT of airworthy aircraft...and some really interesting and less common types (P-26!)