When guests stay at the Jefferson in Washington, the Peabody Memphis or Michigan’s Grand Hotel (pictured above), they know they are supporting a hotel of historic significance. Come Thursday night, they are also staying at a hotel that has won one of the Historic Hotels of America’s 2015 Awards of Excellence, which were announced Thursday evening. A program of the National Trust for Historic Preservation, the Historic Hotels of America will accept only member hotels that have been designated a National Historic Landmark or that are eligible for listing in the National Register of Historic Places. The hotels also have to be recognized as having historic significance and be at least 50 years old. CNN has put together a slide show of the award winners which you can view by clicking here.