I'm a huge fan of re-photography - the practice of re-staging old photographs as precisely as possible and then comparing the earlier and later. Third View, focusing on the American west, is a good example. But these shots of St. Petersburg today/Leningrad during the seige take the concept to a whole new level. It's like you can see through time (with English text here, which might actually be the original posting location - I'm not sure).

(via)