I have been to mudhouse mansion, beings Im only 5 minutes away. Its boarded up, but im sure you can still get in. it took minimal effort to kick in the door, but then again, i weigh 240 lbs..sooo.
You have to follow mudhouse road to the back of the house, and drive through a large field to get to the house. The basement was set on fire by 2 idiots that were messing around with matches. I dont think the structural integrity was harmed by the small fire, though. Im not sure what part of Columbus you're from, but chances are its a 40+ min drive...