Alleged to be a hotbed of paranormal activity, the lavish Grisso Mansion in Seminole, Oklahoma, was built in the 1920s by a pharmacist-turned-oilman. A magnificent local landmark that was once a hub of high society, a dark past lingers within its walls. As the current owners look to sell up for $1.8 million (£1.5m), click or scroll on to take a tour of the mansion, delve back through its chequered history and glimpse the eerie 'ghost' that was caught on camera in the ballroom. Feeling brave?