We are currently OPEN 7 days a week!

Seven days a week- 9 am to 5 pm (first tour at 9:30 am and the last tour at 5:00 pm)

Explore South Dakota's Biggest Mystery


Mystery House
From $14

You'll wonder how it all works at this mysterious attraction where you can stand on the walls and balls roll uphill.

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Mystery House
Geode Mine
From $6

Pick up a hand spade and start digging for your very own geode!

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Geode Mine
Visit Us
From $14

Hours of fun for the whole family!

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Visit Us

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 Friday, Saturday and Sunday (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)

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.

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Our Happy Customers

Phil G.
Really, really interesting.

I had heard about this place before, but I thought it was all hype. I was wrong. It is a really cool place, and I was amazed almost from the start. Definitely worth the price of admission. If you can figure it out, please let me know.

Jeannine L.
Very cool!

Makes your brain go topsy turvy trying to figure out what's happening. The kids LOVED it!

Tracey J.
We honestly were blown away by the experience.

My husband has been wanting to go here for a long time and we were finally able to make that happen. Our kids were just as blown away as we were and had a great time! It is such an extraordinary place to visit and you can't even explain what is happening. If you are able to go then you definitely should. There are so many things that you can't even explain and we'll just keep you wondering not only when you're there but once you leave. Our tour guide was not only funny but just a great guy to have as our guide. The kids really enjoy doing the geo find at the end of the tour also. They even have a small little gift shop.

Angel S.
This was such an awesome place.

I've wanted to go since I was a kid and finally made it with my own children. We all loved it. So glad there was parking in the shade and cool weather as we traveled with pets.

Our Story

In 1952, two college boys searched the Black Hills looking for the perfect spot to build a summer cabin. Upon their search, they stumbled into the mysterious world of the Cosmos.

Our Story