There's plenty of beauty across the Hoosier state, but even more to explore underneath the surface. If you've never checked out some of Indiana's coolest caves, tunnels, or underground hidden places, then check out this list of 7 places that will make you wish you lived underground.

1. Squire Boon Caverns - Mauckport

You'll find these enchanting caverns underneath of Squire Boon Village where there's a pioneer village and grist mill to explore. Check out the real beauty underneath on a one hour cavern tour.

Find it at 100 Squire Boone Rd SW, Mauckport, IN 47142

2. City Market Catacombs - Indianapolis

Also dubbed the Tomlinson Hall Catacombs, these creepy, yet stunning underground rooms have quite a history. They were built in the late 1800s and have been used as a basement, a homeless shelter, a refugee camp, a supply depot, and even a firing range for police officers. Pretty awesome!

Find them (by appt. only) at 222 E Market St, Indianapolis, IN 46204

3. Margeno Caves - Margengo

This super popular cave system will absolutely astound you in person. The unique tours and cave formations you'll find here will have you wanting to stay underground just a bit longer.

Find it at 400 East State Rd 64, Marengo, IN 47140

4. The Lost River - Orangeville

The Lost River is a river that seemingly disappears for 23 miles and then pops back up in Orangeville. However, the river doesn't really disappear - it just goes underground, which is really awesome. This river has been dubbed a National Natural Landmark for two different reasons: 1) the way the river sinks into the limestone and seemingly disappears for miles is remarkable and 2) the underground river system is distinctly unique.

Find it at 38°37′52″N 86°33′26″W (there's no exact address - but these coordinates will get you to the rise).

5. Indiana Caverns - Corydon

Indiana Caverns offers a unique walking or boating experience through this gorgeous cave system in southern Indiana. Tours last for about an hour, though you'll find yourself wanting to linger underground for much longer.

Find it at 1267 Green Acres Dr SW, Corydon, IN 47112

6. Bluespring Caverns - Bedford

This gorgeous cavern offer the ultimate boat ride through a remarkable cave system. What sets Bluespring's apart is the unique opportunity you'll have to spot blind and albino cave wildlife, from fish to amphibians.

Find it at 1459 Blue Springs Cavern Rd, Bedford, IN 47421

7. The Twin Caves - Mitchell

These gorgeous caves are available to explore in warmer month by boat ride in Spring Mills State Park. You'll also find cool wildlife here, from blind crayfish to unique bats.

Find it at 3333 State road 60 E, Mitchell, IN 47446

Who else is ready to stay underground to explore the deep beauty of Indiana? For more awesome sights, check out this post.