Can you guess the year, and where this photograph was taken? We'll give you a hint: it's in Manhattan. As always, we'll update this post later with the answer and more details. Cheaters and anyone who makes an Instagram joke will be banished.
UPDATE, 5:15 p.m.: We've now added more photos from the set, all courtesy of the MCNY. These photos were all taken between 1882 and 1883, from the roof of George Ehret's home at Park Avenue and 94th Street. Click through for more detailed descriptions of each shot, and a look at a still under-developed Upper East Side.
