This probably falls outside a typical roadside oddity but I love mid-century modern furniture and architecture and, in my mind, the style is closely related to roadside Americana.
At the Henry Ford Museum in Detroit is the only place to find the “Home of the Future” today! The Dymaxion House was created to be an efficient home of tomorrow. It’s a domed building with little privacy but maximum space! I really love it. Check out the wiki entry about it here.
Check out this photo to understand the exterior!
Here’s a sampling of my photos of the interior of the Dymaxion House:
Two views of the dining/living room:
Sadly, I don’t have any pictures of the bedroom! The closets were so cool! You can find more images here!