Ultralight Aircraft National Air and Space Museum

The concept of gliders propelled by small engines emerged in the 1920s, but didn't rise in popularity until the 1970s. 

Great aviation museums—Northeastern US - AOPA

Air Space Museum Dulles – NeverStopTraveling

Ultralight trike - Wikipedia

News & Video on Light-Sport Aircraft, Sport

Grob 102 Standard Astir III National Air and Space Museum, grob

The AC-35 Autogiro could fold back the rotors and switch engine

Inside the Smithsonian's Steven F. Udvar-Hazy Center - CNET

Pterodactyl Ascender - Wikipedia

Yes, the aircraft from Fly Away Home was the real deal. Curator

Pitts S-1 Special Wings Over the Rockies Air & Space Museum

National air and space museum airplane hi-res stock photography

College Park Airport and Aviation Museum – College Park, Maryland

Smithsonian hosts GA fly-in - AOPA

Piper J-3 Cub, National Air and Space Museum Steven F. Udv…