In which southern U.S. city can you find this gleaming tower known as the Sunsphere?

Built for the 1982 World's Fair, the 266-foot, gold orb-topped Knoxville Sunsphere was an immediate hit with Tennesseans. Over time, however, interest waned and the tower fell into disrepair. After sitting derelict for many years, it was restored and reopened to visitors in 2007.

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