33 Thomas Street, a "550-foot-tall (170 m) windowless skyscraper" in Tribeca, has no windows at all — its walls are "entirely covered with precast concrete panels clad with flame-treated textured Swedish granite," according to Wikipedia. One observer claims it "features the tallest blank wall in the world."
Built for AT&T between 1969 and 1974, it was designed to be self-sufficient and "protected from nuclear fallout for up to two weeks after a nuclear blast."
In 2016, journalists at The Intercept reported that "the building is a National Security Agency (NSA) mass surveillance hub code-named TITANPOINTE," citing the Edward Snowden disclosures. The reporting tied its rooftop equipment to an NSA satellite intelligence system and a nearby FBI building.
The tower has failed spectacularly once. On September 17, 1991, a power foul-up disabled its switch: "More than five million calls were blocked," and air traffic control was disrupted at 398 airports serving most of the northeastern United States.
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