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(Image of Emperor Tughlak, taken by John Sache in the mid-19th century)

Great video presentation of historical images of India juxtaposed with current photos: LINK.

Bonus: An old favorite of mine is Kamat’s Potpourri, which has all sorts of awesomeness around the theme “India’s history, mystery, and diversity” — particularly enriching is the site’s photoblog.

Super-bonus: There’s some interesting British Raj photography on Harappa, and the site also offers cool vintage postcards, engravings, and lithographs.