Franklin Castle (also known as the Tiedemann House) is a Victorian stone house, built in the American Queen Anne style, located at 4308 Franklin Boulevard in Cleveland's Ohio City neighborhood. The building has four stories and more than twenty rooms and eighty windows. In the late nineteenth century, when it was built, Franklin Boulevard was one of the most prestigious residential avenues in Cleveland. It is reported to be the most haunted house in Ohio. On March 15, 1982, it was added to the National Register of Historic Places.