Paris-based photo enthusiast Alexis was passing a thrift store near his home recently when he noticed some strange looking optical equipment. Upon entering the shop for a better view, he discovered that it was an old stereograph viewer with ground glass in the rear. The store owner informed him that the viewer came with a box of roughly 50 glass plates made in France in the 1930s. Alexis jumped on the deal and, upon returning home, was pleasantly surprised to find that the images where beautiful 3D photographs of what living in France was like nearly a century ago.
You can find more of the images here, or check out some anaglyph versions here.