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Climb Higher Than Mt. Everest, Without Leaving Manhattan

Who knew such extraordinary altitudes could be found, hidden inside the towers of Manhattan's Flatiron District? But, behind the nondescript door of a 5th-floor office on 21st Street, heights as great as the Himalayas are waiting to be scaled. Gizmodo took a deep breath and visited the atmospheric wizardry of Hypoxico » 2/13/14 6:33pm 2/13/14 6:33pm