Pick up a hand spade and start digging for your very own geode!
Explore South Dakota's Biggest Mystery
Hours of Operation
We can get very busy during the summer. We strongly suggest that you purchase tickets online in advance to ensure you get a spot on one of our tours.
April & October - 9:30AM-4:00PM (tours every hour from 10:00am-4:00pm)
May & September - 9:30AM-4:00PM (tours vary daily from 10AM-4PM)
June, July & August - 9:00AM - 6:00PM (tours every ten minutes from 9:30AM-6:00PM)
Holidays (Memorial day, 4th of July, Labor Day) - 9:00AM-5:00PM (tours every five minutes from 9:30AM-5:00PM)
Family Fun Attractions For All Ages
Combine a 40 minute cabin tour with our other activities for hours of family fun that will turn into a lifetime of memories. After you tour our Mystery House and dig up some treasures in our geode mine why not cool down with some ice cream? Then browse our huge gift shop full of souvenirs from the Cosmos Mystery Area and the Black Hills of South Dakota. Bring a picnic lunch and enjoy it on our deck that overlooks the amazing surrounding wilderness.
You'll wonder how it all works at this mysterious attraction where you can stand on the walls and balls roll uphill.
Hours of fun for the whole family!
Don't forget to check out our Gem Mine during your visit!
Separate and recover gems, fossils, arrowheads and minerals using our sluice. Match your findings to your gem index to discover what types of rocks you’ve collected! A hands-on activity for the whole family to enjoy! We offer several different options of mining dirt in our Gift Shop.More Information