The Arsenalen tank museum outside Stockholm, Sweden, is home to many military vehicles all owned by the Swedish Government. Artifacts in this collection of machinery of the past are up to a century old, including rare tank and vehicle prototypes. Has about 350+ military vehicles with about 75 displayed at a time.
The EAA Aviation Museum in Oshkosh, WI, displays 200+ historic planes and replicas, while celebrating experimental aircraft and innovation in airflight technology. In addition, there are some military vehicles, along with lots of written historical documents and memorabilia.
If you’re visiting Glacier National Park, you must make the 70 mile trip to see the Museum of America Museum in Polson & huge collection of Americana.