Erebus, the 4 story Haunted House is located in Pontiac, Michigan and was entered into the Guinness Book of World Records as the World's Largest Walk-Through Haunted Attraction in 2005.
Schedule: http://www.hauntedpontiac.com/date.htm
Official Website: http://www.hauntedpontiac.com/
Added by folkie on October 20, 2010