Old buildings keep lots of stories within their walls. Some are bright and beautiful, while others are so dark and disturbing. Across the U.S., many homes, estates, and other landmarks have become infamous for the ghost legends that surround them: Lincoln sightings in the White House, Mark Twain’s haunted home, and, of course, the entire city of Salem, Massachusetts. These sites welcome visitors year after year, and they offer a fascinating mix of history, mystery, and the supernatural.