You used to be what? These luxury hotels and resorts didn't start out as rooms for travelers. Increasingly popular, adaptive reuse – renovation projects with minimal changes to the buildings - has turned these historic non-hotel properties into luxury hotels. Offering unique travel experiences and unbeatable locations, in former lives some of these buildings were prisons, monasteries, libraries, private homes, military barracks and more. Repurposing historic buildings and reinventing them as modern hotels provides travelers with one-of-a-kind accommodations and the chance to stay in a part of history.