Take a tour of Hilton's 20 Historic Hotels — usatoday.com

Hilton Hotels and Resorts can now count 20 of its hotels as Historic Hotels of America. To earn the designation by the National Trust for Historic Preservation, the hotels had to meet certain criteria. They have to be at least 50 years old and have historical significance. They also have to be designated by the U.S. Secretary of the Interior as a National Historic Landmark or listed in or at least eligible to be listed in the National Register of Historic Places.

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