The haunting reflective pools here are not only lit up but surrounded by choral music to make the experience all the more dramatic. Although the cave is named after a type of cheese, you won't find any here.

Believe it or not these caves are somewhere in the neighborhood of 400 million years old. If you go, be careful of the monkeys that populate the area--they're notorious for taking things right out of the hands of visitors.

You can actually take tours of this glacier cave which I think sounds amazing. Not surprisingly, this is a UNESCO World Heritage site.

It takes about an hour and a half to complete the tour at this UNESCO World Heritage Site which includes part of the Reka River. Make sure to bring a sweater as temps really drop when you reach the bottom.

Believe it or not this cave was only discovered in 1991. As you can see it has an underground river in it and it lies right on the border between Vietnam and Laos.

روعة المكان،، سبحان الله

Fingal's Cave in Staffa, Scotland

Located on a completely uninhabited island in Scotland, this cave was actually formed by lava. It's known as "The Melodious Cave" because of the eery sounds the waves make against the opening.

I could never do this--waaaaay too claustro for me plus I've read that the water here is freezing.

Even if you're not into caves this is an absolutely stunning park with camping, hiking, etc. The wildlife here is totally amazing--animals I've never seen before in my life.

What did you see there, Courtney? Most of the creatures I saw in Iceland were birds.

Look closely--see all those little things clinging to the wall? Guess what those are? BATS!!! Yes, this is a literal Batcave!

Love the serenity of this.

Yup, this is ice--pretty amazing, no?

They call this the Wind Cave because of the air that blows through the entrance here. When mining efforts didn't work out, the manager of the cave decided to turn it into a tourist attraction.

Important both for its high biodiversity and for its karst features, Gunung Mulu National Park, on the island of Borneo in the State of Sarawak, is the most studied tropical karst area in the world. It is one of 3 World Heritage Sites in Malaysia!

Is it me, or does that rock look like Abraham Lincoln???

Incredible!

The lion's feet at the bottom of this are amazing! Would love to also see the frescoes here as well. Also would love to see the rock that's polished so well legend has it you can see your face in it.

These paintings are thought to be about 17,000 years old, although they look almost modern. They were actually discovered by a group of teenagers in the 40s and in 1979, the caves were named a UNESCO World Heritage Site.

While it looks serene here, the town population triples at the height of the tourist season so be careful about when you go.

did a rope descent here. Very cool!

Believe it or not these beautiful glowing strands are created by gnat larvae. These streamer-like threads are actually silk spun by the larvae to catch prey.

It's been called a "grand, gloomy and peculiar place" by one of its first explorers and at 390 miles of explored area, it's the longest known cave system in the world.

There are actually 117 caves here so you've got a lot to choose from.

Interestingly, if you've been in another cave recently and you're wearing the same clothes, you may have to change. Something called "White Nose Sydrome," which is caused by contamination from other caves, hurts the hibernating bats here.

At 160 miles, this is the second longest cave in the world.

You can actually take a snorkeling tour here--pretty cool, isn't it?

I've heard there are quite a few of waterfalls here!

There are lots of great programs and events here that explain the region, the cave, and the wildlife in and around the glaciers.

This might be my favorite of all the caves here--this is literally just solid marble and is absolutely stunning!

Believe it or not this cave is about 180 million years old, although the lighting is clearly modern.

Make sure you're in good health before coming here--you need to be able to do some pretty rigorous climbing. Also, as you can probably guess, it's not exactly warm in here.