15 hotels that used to be prisons

While the idea of turning prisons into hotels may have seemed strange at first, countries all over the world now offer accommodations that once stood as correctional facilities.

Some have been completely transformed, but if you take a closer look, you can still see remnants of their fascinating and frightening pasts.

Others, however, have chosen to leave a large part of their buildings in original conditions.

From Boston's chic Liberty Hotel to the spooky iron-clad corridors of the Jailhotel in Switzerland, here are 15 hotels with a haunting past.