Since it is now officially SUMMER, I thought I would explore a few lesser known bus/transportation destinations around the country. In my search, I discovered a delightful museum located in St. Paul, MN (193 Pennsylvania Avenue E., St. Paul, MN 55130 - 651-228-0263).
It is officially called the "Minnesota Transportation Museum". Their website is http://www.mtmuseum.org/ and they have some delightful photographs of their Museum on it including several buses.
Here's what they list as parts of their Museum:
Jackson Street Roundhouse
Osceola & St. Croix Valley Railway
So you can see they are more than buses--but most bus fans also like other commercial transportation. So if you are going out that way--check them out and let us know what you thought.