The House of Mystery exists as a location simultaneously in Kentucky and in The Dreaming. The origins of the House of Mystery are unknown. In fact, very little is known about the House of Mystery in general. The architecture is indeterminate and changes periodically. The same holds true for the inside of the house: the rooms constantly shift, and one never enters the same room twice. The House of Mystery lies in the same graveyard as the House of Secrets, its companion. Whereas Abel resides in the House of Secrets, Cain makes the House of Mystery his abode.