Goodyear Airdock Hangar!
The Historic "Goodyear Airdock Hangar" in Akron, OH. At 22 stories in height and over 800 ft in length, it is claimed to be one of the largest volume buildings without internal support in the world. The Goodyear Air Dock is 1,175 feet (358.14 m) long, 325 feet (99.06 m) wide, and 211 feet (64.31 m) high, supported by 11 steel arches
Everything you ever wanted to know about the hangar can be found at en.wikipedia.org/wiki/Goodyear_Airdock