Promenade in 3D

Wonderful New York Public Library project, bringing their archive of stereogram photos from the 1890s and 1900s to life.

You pick an original stereo image, as designed to be viewed through the special viewer, from the NYPL archive:

Then you use the Stereogranimator to create an animated gif, and you can see the 3D image in all its glory:

GIF made with the NYPL Labs Stereogranimator

Just look at those lovelies parading on Brooklyn Bridge.

You can also make 3D analgyphs, which look like you could view them through 3D red and green specs.

See it for your self - there are over 750 images!
NYPL Labs | Stereogranimator