Explore South Dakota's Biggest Mystery

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Attractions

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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Geode Mine

From $6

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

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Visit Us

From $14

Hours of fun for the whole family!

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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 - 9:00AM - 5:00PM (tours vary from 9:30AM-5:00PM)
August 1st thru 17th - 9:30AM-5:00PM (first tour at 10AM and last tour at 5PM) Tour times vary daily so please call ahead.
August 18th thru 31st - 9:30AM-5:00PM (Monday-Friday first tour at 10AM and last tour at 4PM) (Saturday and Sunday first tour at 10AM and last tour at 4:30PM) Tour times vary daily so please call ahead for more information
Holidays (Memorial day, 4th of July, Labor Day) - 9:00AM-5:00PM (tours every five-ten 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.

Geode Mine

1531 Reviews

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

From $6

From $14

Mystery House

1531 Reviews

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

From $14

Visit Us

1531 Reviews

Hours of fun for the whole family!

Book Now

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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Cosmos Mystery Area

4.5

Based on 2389 reviews

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Nataly Lerma

22:37 10 Jul 23

I really enjoy my time here always. This time my son was 7 years old and he had a blast. Our tour guide was super nice a d he let the children participate which we thought was pretty cool.

Luke Steffen

22:42 04 Jul 23

This place was incredible fun. I have no issues with dizziness and this place threw off my equilibrium. It even took a few minutes after the tour to feel normal. The kids loved it.

chris hobelman

00:29 03 Jul 23

Just a fun quick trip to this location. Nice gift shop with shirts and food. Restrooms are on location. Staff was awesome and so was our guide.

hodelia hayat

21:26 17 Jun 23

First off, WTH. Balls rolling uphill, water doesn’t follow gravity, a pushed weight goes more in one direction and walking on walls?!? Our tour guide was funny and good. The kids and us were so weirded out, but we can’t wait to go back!

Rachel Jenson

21:06 30 Apr 23

We really enjoyed Cosmos! The tour was great, it was such a fun little stop. Our tour guide Rileyn ( sp?) was great, very funny and engaging. Definitely recommend!

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