The Griggs Mansion is for sale on Summit Ave in St. Paul. The estate is known to be the most haunted house in St. Paul. All for the bargain price of 1.1 million--which is actually a steal, if you can handle living with the entities that haunt the mansion!
Ruperra Castle: Abandoned Mansion in Wales - built in 1626. It hosted King Charles I after the Battle of Naseby in 1645 and was rebuilt after a fire in 1785. It was used during WWII by the British Army when it was gutted by a second fire in 1941. It's been decaying ever since. In 2010 it was put up for sale for 1.5 million pounds.
Ruperra Castle: Abandoned Mansion in Wales | Urban Ghosts