Krakow, Poland historic district
Russian chemist and photographer Sergei Mikhailovich Prokudin-Gorskii was one of the first to use color photography in the early 20th century in Russia. 
In 1907, the photographer decided to systematically document the Russian Empire and was given a specially-equipped railroad car darkroom by Tsar Nicholas II for the project.
To create his images, he used an oblong glass plate through three different color filters of red, green, and blue, projecting them in slides on top of one another to create a full color image.
Today, more than 2,000 of his images are preserved by the Library of CongressWe’ve put together a collection of some of his most striking images.