Just like snowflakes, each one of these wonders is totally and completely unique. Some are made out of ice, some are made out of rock and some are even man-made. That's why you'll want to put visiting all of these formations on your bucket list ASAP.
Thanks to 6,000 years of waves slapping up against the calcium carbonate of this rock formation, the underside has eroded into a series of marble caves, featuring shades of teal, yellow, purple and green.
Even though this natural cave is only accessible by water, it's worth the trip. It features a natural occurring oculus on top of a secluded beach (similar to this one) and is a mesmerizing sight to see when the sun illuminates it from above.
Visitors from all over the world flock to this natural wonder, which was named after the reeds that grow at the entrance to the cave. Colorful lights turn it into an exciting art show.
These beauties are made out of ice in Icelandic glaciers and glisten even brighter than your prized jewelry collection. But they're only safe to enter during the winter when the temperatures are cold enough to harden the ice.
Even though these caves were only discovered in 1971, they've easily become some of Italy's most famous underground wonders. Mostly, because they are filled with an abundance of and .
Named after the naturalist who discovered this formation back in 1772, this cave is famous for its hexagonally jointed basalt columns, naturally arched roof and eerie sounds made by the lapping of waves.
In the Tham Ting, which is the lower cave, there are thousands of Buddha statues covering the limestone cliff shelves. All of the figurines are unique and are in different positions, including teaching and meditating poses.
This National Natural Landmark is famous for being filled with an array of calcite crystal formations, especially , which is essentially a twisted or curved stalactite.
Mesa Verde National Park features homes built into the side of caves by Anasazi or Ancestral Puebloans back in the 13th century. Amazingly enough, after 700 years paintings of animals are still visible.
It might be hard to see, but the ceiling of these caves are covered in bioluminescent glowworms that give off a blue light. Once visitors' eyes adjust to the dark environment, they'll see what look like a night sky filled with tiny turquoise stars.
As part of the Mulu Caves system, this particular cavern is 570-feet-wide and 400-feet-high. But its real claim to fame is that it features a rock that resembles Abraham Lincoln's profile. We can't make this stuff up.
Not only is this the longest cave system in the world, boasting more than 400 miles of network, but new caves are being discovered continuously. Hence how this subterranean area got its nickname.
This two-mile-long cave system in the Ural mountains is one of the country's oldest and biggest underground wonders. Thousands of tourists visit it each year to see the natural ice formations hidden inside.
As part of the third largest underwater cave system, divers from all over the world travel to experience this wonder. And the turquoise water that surrounds it only makes it more magical.
Even though this is the world's largest cave, it was just discovered in 1991. It was created two to five million years ago and is the result of river water eroding away the limestone underneath the mountain, and after time, the weak ceiling collapsing.
If you prefer to visit man-made tourist attractions on vacation, you'll love this Gothic castle, which was built directly into the natural rock arch of this cave. However, both are insanely old, with the first historic mention of the castle happening in 1274.
Not only is this the second largest cave chamber, but the only way to enter is by being lowered on a special rope. Needless to say, this is a thrill seeker's dream come true. The entrance also provides light during the day.
All the way back in the 2nd century BCE, Buddhist monuments were carved into stone and still exist today. A British officer rediscovered them back in 1819, which is why visitors can enjoy the detailed carvings today.
This series of limestone and dolomite caves has been a popular attraction for divers since 1881. Even though the deepest recorded dive is around 393 feet, no one has reached the bottom yet, meaning there's still more to learn about this unique creation.
Since Mount Erebus is the warmest place in Antarctica, the combination of heat and ice results in these beautiful ice caves. Inside, many of them feature stunning ice crystal formations.
King Chulalongkorn built the Kuha Karuhas pavilion inside of this cave in 1890 after he fell in love with the beauty this natural creation had to offer. Today, it's quite a trek to get inside, with visitors having to gear up for a hike before reaching their destination.
These limestone caves are famous for featuring fossils of over 100 different animal species. Out of the 28 caves that are located in this National Park, four are open to the public for guided tours, including Victoria Fossil Cave.
In the Canadian Rocky Mountains is this natural mineral springs, which is geothermally heated. People flock to this town to experience this natural spa, which promises to have healing powers.
Even though this cave was created 240 million years ago, it was discovered by man at the beginning of the 20th century accidentally by miners. The name means "blown" and refers to the air that's created when a mine gallery intersects with a natural passageway.
Along the rocky coast of the Mediterranean Sea is a series of caves that were created over thousands of years ago. Even though these dwellings used to only be known about by locals, over the past decade nearby development has resulted in more tourists.
This formation is well known around the world for having one of the largest underground canyons. That's part of the reason more than 100,000 tourists visit this rock phenomenon every year.
As one of the country's famous Blue Caves, this spot is a particular delight thanks to the juxtaposition between the turquoise water and the white limestone and sand. It's also the second largest cave in Greece and a wonderful sight by boat.
The first written mention of this cave took place in 1549 and tourists started seeking it out in 1806. Today, the creation is a UNESCO World Heritage Site and gets 200,000 visitors per year in part because of its wide assortment of rock colors.
On the country's most northern coastline is a village called Durness known for its limestone cave, which has one of the largest entrances to any sea cave in Britain and features a waterfall near the back of the chamber.
After a hike through Sedona's red rocks, visitors are rewarded with this beautiful place with a view. You can even sneak inside and relax (or catch your breath) in the secluded space.