"Just outside of Philadelphia is this large, 40-room, late-19th-century castle that was built using limestone and greystone to resemble the famous Alnwick Castle in England. The structure was the home of sugar magnate William Welsh Harrison and includes an extravagant-looking ballroom and dining hall. Today, it is part of the Arcadia University campus and is used as an administrative office as well as a space to host college events." [Time Out]
Castle
Website: Grey Towers Castle
Address: Glenside, PA 19038
Sources: Most Stunning Castles in America