NASHVILLE, Tenn. (WKRN) — The mastermind behind the most iconic portion of the Music City skyline, along with several other prominent Nashville-area buildings, has died. Earl Swensson passed away at the age of 91.

Earl Swensson Associates, Inc. was the firm behind the design of the AT&T Building, better known as the “Batman Building.”

The firm also designed other distinctive buildings in Nashville, including the Opryland Hotel, Wild Horse Saloon and the Monroe Carrell Jr. Children’s Hospital.

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Swensson died from an undisclosed illness.