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Thanks to Aleki for the heads up.

I have to wonder if the psych hospital in the House finale was also a hallucination. It was pretty strange how the street and parking lots were empty. And it looked like he was going to one of those hospitals from the 1940s. — RSmith

MATT: How Vanilla Sky! But nope, sources assure me that House's rehab stint is the real deal. And that hospital's more retro than you think. Greystone Park State Hospital (in Morristown, N.J.) made its debut in 1876 as the not-so-subtly named New Jersey State Lunatic Asylum. The hospital has tended to such patients as singer-songwriter Woody Guthrie, and until the Pentagon was built, it boasted the largest foundation (674,00 sq. feet) of any structure in the U.S.. I'd try to book a TVGuide.com Q&A with the building, but fear I'd be stonewalled.

Source: TV Guide