Spook Cave

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Spook Cave is a flooded cave located about {{convert|7|mi|spell=in}} west of McGregor in rural Clayton County, Iowa. It is privately owned and operated as a tourist attraction offering escorted boat rides into the cave. The cave was first discovered in 1953 and opened for business in 1955.{{cite book |last1=Brick |first1=Greg A. |title=Iowa Underground: A Guide to the State's Subterranean Treasures |date=2004 |publisher=Big Earth Publishing |isbn=9781931599399 |pages=12–15 |chapter-url=https://books.google.com/books?id=SOuOdbOupw0C&pg=PA12 |accessdate=February 22, 2017 |chapter=Spook Cave}}

The cave entrance is located on a {{convert|93|acre|adj=on}} property that also includes a campground and cabins.

The cave is in the drainage of Bloody Run Creek, a small tributary of the Upper Mississippi River. A lock and dam maintain water levels sufficient for boat access; the cave's stream is allowed to drain to its natural, shin-high depth during the winter. Geologically, the cave is in the Driftless Area of Iowa, a region characterized by karst topography, caves, sinkholes, disappearing streams, and cold springs.