Despite living in Savannah for the majority of my life, I had never actually been on a ghost tour until recently. The Hostess City is considered one of the most haunted cities in America. Even in the daytime, the oak-lined streets here hold so much history that it’s not hard at all to believe that spirits could linger here.

The Smithsonian is a national treasure, and its eponymous Smithsonian Institute is a modern-day American castle. Located near the center of the National Mall in Washington D.C., this red, Norman-style castle stands out in a sea of grey presidential monuments and monoliths. It was made from red sandstone in 1855 and originally served as the home and office of Joseph Henry, the first Secretary of the Smithsonian.