“Scratch-Off” Map of Historic New York

What an interesting idea: an online map of old New York City which lets you “scratch off” portions to see the modern city underneath. “[Chris] Whong layered an aerial photograph of New York City from today beneath another one from 1924 (a remarkable find from the New York Public Library), and coded in a ‘scratch-off’ effect. Click and rub your cursor over a section of the old map, and you’ll see modern-day New York revealed underneath. You can search for specific addresses, flip the maps so that new sits on top of old, and opt to simply ‘pan and zoom’ when you’ve done enough scratching.”

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