The Historic Bullock Hotel in Deadwood, South Dakota - This is said to be one of the most haunted hotels in the U.S., haunted by none other than the person it’s named after, Seth Bullock, who died inside the hotel in 1919. The basement in particular is said to be crawling with activity, where it’s been reported that glasses fly off shelves and a presence is felt. Many guests even reported catching whiffs of a cigar or seeing Bullock’s image in a mirror.
Geology and history promise all kinds of adventures in South Dakota's Black Hills and Badlands. Trip guide: http://www.midwestliving.com/travel/south-dakota/black-hills/black-hills-and-badlands-trip-guide/