Niagara Cave, Harmony, Minnesota

Minnesota

Wabasha Street Caves (Saint Paul) and Joseph Wolf Caves (Stillwater) - Enjoy any one of the historic and entertaining "variety tours" offered by Down In History Tours.

Mystery Cave - Located in Forestville State Park, southwest of Preston, Minnesota.  If you go, don't miss nearby Historic Forestville, an 1800s living history village operated by the Minnesota Historical Society.

Niagara Cave - One of the most fascinating and unique geological attractions in the Midwest. Southwest of Harmony, Minnesota.

Wisconsin

Cave of the Mounds - A National Natural Landmark.  Blue Mounds, Wisconsin

Crystal Cave - The longest cave in Wisconsin. Spring Valley, Wisconsin