We are OPEN Seven Days a Week, 9:00AM-5:00PM

Tours run every 10-15 minutes from 9:30AM-5:00PM

WALK-INS WELCOME!

Explore South Dakota's Biggest Mystery

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Mystery House Tour

Enjoy a 40 minute long guided tour through our Mystery House. Here, the world is different, topsey turvey with nothing in it's normal position including yourselves. Experience things like walking on walls and tennis balls rolling uphill. It is an unforgettable family fun experience for all ages!

Geode Mining

Dig to find your very own geode. Get it set up in our hydraulic press to crack it open and reveal the quartz crystals inside. Don't worry, it's all yours to take home!

Gem Mining

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.

Cosmos Mystery Area
4.5
Based on 2389 reviews
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Nataly LermaNataly 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 SteffenLuke 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 hobelmanchris 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 hayathodelia 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 JensonRachel 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!
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