AACA Museum is a nifty fairly large car museum that is a Smithsonian affiliate. They have permanent collections as well as special collections. The first time I visited they had a Lotus exhibit. Several of the owners were in attendance and more than thrilled to talk at length about their various vehicles. Not a shock, if you own a Lotus race car, you're not going to be shy about talking about it.
The AACA Museum is in Hershey, PA and a stone's throw from Troeg Brewery, Outlet stores, Hershey Park, Hershey's Chocolate World, etc. Makes a nice addition to a Hershey day trip. The permanent cars aren't shoved into rows, but generally are put into period displays.
Their permanent collections are the Cammack Tucker Collection, Museum of Bus Transportation, the Kissmobile and the Historic Vehicle Association (HVA) display.