The biggest rooms in the world are those built to store aircraft. Not only are they huge, but some have interesting stories to go with them. For example, the Arium hangar in Germany was built for the production and operation of a new aircraft called the CL160. However, the aircraft project was abandoned, leaving one of the biggest buildings on earth unused. It was reopened in 2004 with a tropical resort inside! Link
Is the topical resort sponsored by a dermatologist?
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I wouldn't want their heating bill
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They should've included the Vehicle Assembly Building at Kennedy Space Center. It is the fourth largest building in the world by volume, and has housed the Saturn V and Space Shuttles.
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