While building a housing development in the 1970s, workers uncovered this sinkhole where giant mammoths came to drink, got trapped, and died. In July 2013, the 61st of the fossilized woolly beasts was discovered, and most can still be seen on-site. You can watch the excavation in progress and take guided tours.
1800 W. Hwy. 18 Bypass, 15 miles south of Wind Cave National Park, Hot Springs, South Dakota, 57747, United States