Get out your 3D glasses and stereoscopes! Because 2D is just not enough anymore, the Library of Congress brings Civil War photos recently spruced up with red and cyan to make “digital anaglyphs,” ooh, aah, eee! If you prefer old timey stereographs, their archives are stuffed with 50,000 of them, from the 1850s to the 1930s, from sexy ladies to Lincoln’s New York funeral. Nerds.