Western Antique and Automobile Museum - Oregon
I don't think it's been mentioned thus far, but there are 70+ a/c at the Western Antique and Automobile Museum at Ken Jernstedt airfield, just south of the town of Hood River in Oregon, USA. Access is via the Columbia River Highway, an hour or so east of Portland. Many of the a/c are airworthy and flown and this museum well merits a visit.