This windowless NYC skyscraper is reportedly an NSA spy hub

The building at thirty-three Thomas Street in Manhattan stands five hundred fifty feet tall, covered entirely in flame-treated Swedish granite, and has not a single window. According to Boing Boing, this architectural anomaly in Tribeca is reportedly used as an NSA surveillance hub. One observer claims it features the world's tallest blank wall. The building's fortress-like design keeps its operations completely hidden from the outside world.

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