In the early decades of photography, stereoscopy was a very popular technique for creating the illusion of depth in photos. These early "3D" images must have seemed like magic, and photographers wasted no time documenting the wonders of the day in this glorious new format. The boom in bridge-building technology provided the perfect subject.
The following twenty animated GIFs were all created from stereoscopic cards over a century old that show beautiful bridges from around the world, picked from the amazing collection of the Swedish Tekniska Museet. No need for special viewing instrument (stereoscope)—just sit back and enjoy the lively, almost three-dimensional view.