Vintage motorcycles at Perkiomen National.

 
A big thanks to David Smith over at Antiques and The Arts Weekly for sharing this great slideshow of vintage motorcycles. These cool bikes were found at Pennsylvania's annual Perkiomen National, commonly known as "Oley," which attracts buyers and sellers from all over the world. This multi-day event always falls on the last weekend in April; there is no website for it, and advertising is mostly word-of-mouth.

Indian1932
Shown above: a 1932 Indian "4"