When You Constantly Push Your Limits You Will Never Reach Them

Come Explore Niagara Cave

On Minnesota’s southern border is a geological marvel known as Niagara Cave. This massive cave located in Harmony, Minnesota was discovered in 1924 when 3 pigs fell into a sinkhole. The pigs’ owners lowered themselves into the sinkhole to rescue the pigs and discovered the cave. After spending almost a decade exploring with candles and lanterns, they decided to open the cave up to the public in June of 1934. It became an instant hit with tourists, and remains so to this day, attracting about 30,000 visitors annually.

Consistently rated as one of the top 10 show caves in North America, people travel from all 50 states and over 100 different countries to take the hour long guided tour through the cave. The tour has been described as an educational adventure in nature that you won’t want to miss!

The wedding chapel

The Niagara Cave is one of the most unique geological locations in the state featuring 100-foot high ceilings and 450 million year old fossils. The one-hour tour will take you past amazing stone formations including the 20-foot tall battleship, the Elephant’s head, the alligator, the wishing well, and stalactites up to 8 feet long. The main attraction inside this cave is the beautiful waterfall nearly 60 feet tall. There is also a wedding chapel inside the cave, where more than 400 weddings have been performed

After exploring the cave, be sure to head over to the 18 holes of mini-golf putting greens, or enjoy lunch in the picnic area and playground. With so much to see and do, it’s no wonder Niagara Cave is one of Minnesota’s most popular tourist attractions.

The Niagara Cave’s gift shop is packed with all kinds of mineral-related keepsakes, and the kids will love the Mining Sluice where they can uncover precious gemstones, fossils, and other hidden treasures using water and a sifter.

Cave tour season begins in April with just weekends. Daily tours run May through October. The cave is closed November through March except by appointment. For more information visit:


or call

507 886-6606


  1. Kirby

    Wow, marvelous blog layout! How long have you been blogging? you make this look easy. The overall look of your website is wonderful, love the content and all the great locations!

    • marklongmainstream

      Thanks Kirb’s, I worked hard to design a layout that was easy to navigate. I love writing and love Adventure, so it comes very easy for me.

  2. Bryan

    Pretty great post. I just stumbled upon your blog and wished to say that I’ve truly loved browsing your blog posts. In any case I’ll be subscribing for your rss feed and I look forward to reading more from you soon!

    • marklongmainstream

      Thank you Bryan, many more articles coming soon, thanks for reading!

  3. Dave

    Great information, next time we are in Minnesota i will have to plan a trip to the cave thanks for sharing

  4. Jamie

    We plan our vacations based on the adventures you share on this page, we love what your doing and cant wait to see where you send us next. Our kids have loved learning about all the caves around the midwest. Great work!

    • marklongmainstream

      Thanks Jamie that is so awesome, I love hearing from my readers, feel free to post any pictures on the mainstream adventures Facebook page.

  5. heath

    Do they do any spelunking or wild tours?

  6. Lauren Samson

    I couldn’t resist commenting. Exceptionally well written!

  7. Oliver

    Cool cave, may have to take a visit this weekend!

  8. Heather

    Love this blog/website, lived in Minnesota all my life never new this cave existed. My have to plan a visit soon.

  9. Carl

    Really want to visit this place now, thank you

  10. Barb

    Remarkable things here. I’m very glad to see your article. I will be planning a trip soon.

  11. Cameron

    This is the best outdoor blog in the Midwest, looking forward to visiting some of these locations.

  12. Alex

    I want to to thank you for this good read!! I certainly enjoyed every little bit of it. I’ve got you book-marked to look at new things you post…

  13. Donna

    Love reading about all the show caves on this page! If all website owners and bloggers shared such great content as you, the internet would be a lot more useful.

  14. Engrid

    You seem to do a lot of spelunking, so my question to you is which cave is your favorite and why? By the way my husband and I follow this site and the Facebook page quite often and I must say this page has to be one of the highest quality blogs on the net. I recommend this website to all my friends around the Midwest!

    • marklongmainstream

      They are all great for many different reasons, in the Midwest, my favorite is Crystal Lake Cave, it’s not as big as some of the others, but it has so many different crystal formations, and anthrodites that you just can’t find in a lot of caves. Niagara Cave is also very cool due to the huge waterfall inside. There are many more that I have yet to visit, so my answer may change over time.

  15. Doug

    The cave was huge, I was freezing by the time I got back out. Well worth the trip though. Its beautiful inside.

  16. Cliff

    Never knew this cave was in Minnesota! Road Trip! Thanks for sharing.

  17. Julie

    Perfect get-a-way on a hot summer day!

  18. Chris

    Beautiful cave, a lot bigger then I expected.

  19. Tom

    Looks beautiful!

  20. Al

    Been here twice, its nice!

  21. Ghram

    It felt so good inside the cave on this hot day! Beautiful cave thanks for sharing!

  22. Andy

    This is one cold ass cave, dress warm if you visit!

  23. Steve

    This was a fun tour, with some cool info well worth the trip to the middle of nowhere.

  24. Jennifer

    This was one of my favorite places to visit when I was a kid. Such a big cave with so much to see. Good memories.

  25. Jordan

    This is my favorite cave in Minnesota, just beautiful.

  26. Douglas

    Beautiful cave in the middle of nowhere.

  27. Jose

    Damn, this would be a good way to cool off in the summer.

  28. Ed

    i love this waterfall, i wonder if anyone has ever repelled down and explored that section of cave.

  29. Karen

    Bring a coat, it gets cold inside.

  30. Laryn

    beautiful cave and a fun tour

  31. Greg

    This is a fun place to spend a rainy day or even a hot summer day. Very large cave with a rich history. Mystery cave is also nearby and is just as cool.

  32. Carol

    Really wish this was not so far away. visited when i was a kid and would love to take my kids for a visit but its completly in the middle of nowhere.

  33. Logan Fox

    We decided to make the 2 hour drive to the cave today, I must say i was pleasantly surprised. The cave is much larger then I had imagined, and the waterfall is beautiful.

  34. Heather

    Fascinating history

  35. Joey

    One of Minnesota’s best kept secrets.

  36. Eric

    I had no idea such a big cave was here in Minnesota. Kinda scary how large it is. Beautiful cave well worth the drive.

  37. William

    There is nothing scary here. Its just a big cave, been here millions of years. Relax snowflake!

  38. Forrest

    Natures masterpiece!

  39. Jerry

    Looks pretty, but tight spaces freak me out!

  40. Anne

    This is a gigantic cave, with a great gift shop. Bring a jacket it gets cold, also lots of steps.

  41. Edward

    I love all the caves you post about. I never realized there were so many in the area. Adding this one to my list. Thanks for posting!

  42. Heidi

    Really enjoying your blog and all the cool places you send me to. Don’t get to Minnesota much but if I do i will be looking this cave up and taking a visit. Thanks for the work you do.

  43. Sherman

    Excellent beat !

  44. Paul

    I need to check this out.

  45. Alyce

    We were camping in bluffton and it was raining so we decided to make the trip to harmony and tour the cave. very nice trip, glad it was raining. the cave was beautiful and HUGE tahnks for posting

  46. Lois

    This sounds like a fun place for our family, but is it worth the drive from Saint Paul? Is there anything else in the area to do?

  47. Eric

    cool place to bad the guy that runs the cave is a complete dick

  48. Kris

    The cave was cool but I was most impressed with the gift shop, my husband had to drag me out of there. Thanks for sending us, we had a great time!

  49. Melanie

    I have not been here since I was a child, this brings back memories!

  50. Joleen

    This cave looks COOL!

  51. Kathleen

    I love all your destinations on this page, you have a fantastic blog!

  52. Valerie

    at first i was said they wanted to charge me admission but after getting inside the cave it made more sense. well worth the price to get in.

  53. Rafe

    Is this the only show cave in Minnesota? Its about a 4 hour drive from us, is there anything closer to St Paul? Thanks

  54. Darla

    Your grammar sucks! Cool cave though.

  55. Caryn

    Stopped by here on a whym, it was a very nice tour and the gift shop was great.

  56. Sara


  57. Leia

    Another great attraction up this way.

  58. Mark

    I used to be a tour guide here when i was in high school. This is a great cave and a fun place to work.