Vatnajokull Glacier Caves (Iceland)
Glacier caves are incredibly beautiful, but they are also dangerous and have short life spans. Every year, caving experts seek out the coolest ice caves in Vatnajokull, Iceland. These incredible caves glow a brilliant blue color and are very cold.
Cave of Crystals (Mexico)
The Cave of Crystals is located nearly 1,000 feet underground and features some of the largest crystal formations in the world. These massive gypsum crystals are as much as 36 feet long and were formed from ancient volcanic activity.
Škocjan Caves (Slovenia)
Škocjan Caves is one of the world's largest cave systems and features a river running through almost the entire length of the caves. Probably the most impressive site is Martel's Chamber, which is one of the largest underground chambers in the world.
Mutnovsky Volcano Ice Cave (Russia)
The area around the Mutnovsky Volcano in Russia is a strange mix of fire, water, and ice. Tucked away under the surface is this incredible 300-foot ice cave that follows a small mountain stream.
Cave of Swallows (Mexico)
When you can base jump into the mouth of a cave, you know it's awesome. The Cave of Swallows is located in San Luis Potosi, Mexico and is the largest known cave shaft in the world. The opening covers over 3,000 square meters and goes so deep that a skyscraper could fit inside of it. Climbing back up from the bottom can take up to two hours!
Fingal's Cave (Scotland)
Fingal's cave lies on the coast of an uninhabited island in Scotland and is formed of hexagonal basalt columns resulting from volcanic activity. The cave's size and structure cause it to have an eerie sounding echo, which is why it was originally known as "the melodious cave."
Waitomo Glowworm Caves (New Zealand)
Take a trip to the North Island of New Zealand to discover the amazing Waitomo Glowworm Caves. These caves house a unique species of glowworms that can be viewed by underground boat tours.
Tham Lod Cave (Thailand)
Thailand has some of the most beautiful scenery in the world, and its caves are no exception. Tham Lod Cave is an impressive natural limestone cavern that features a clear stream running through the middle. Guides offer boat and kayak tours using lanterns for light.
Mammoth Cave (United States)
Located under central Kentucky is Mammoth Cave, the largest cave system in the world. With over 400 miles of surveyed passageways sprawling out across 52,000 acres, it's double the size of the next closest cave. The cave features a number of different tours, including the Wild Cave Tour where visitors crawl, climb, and squeeze through rarely seen portions of the cave.
Majlis al Jinn (Oman)
You have to travel to the nation of Oman on the Gulf Coast to see this amazing cave system. Majlis al Jinn, which means "Gathering Place of the Genies," is the second largest cave chamber in the world. The only access to the cave is through one of three holes in the ceiling.
Reed Flute Cave (China)
Reed Flute Cave is a popular attraction in Guangxi, China that feautres multicolored lighting inside of the cave. The cave itself is nothing special, but the lights make it a place of wonder and beauty.
Harrison’s Cave (Barbados)
Harrison’s Cave is a must-see attraction on the island of Barbados. This cave features some amazing rock formations and waterfalls, and you get to see the whole thing from the comfort of a train that runs through the middle of it.
Eisriesenwelt Ice Caves (Austria)
Just south of Salzburg, Austria is a limestone ice cave hidden in the Alps. The Eisriesenwelt Ice Caves were originally discovered in 1879, and the name means "world of the ice giants". These caves are a popular tourist destination because they stay frozen year round.
Batu Caves (Malaysia)
The Batu Caves are found near a small Malaysian village of the same name. The caves were formed inside of a large hill, and the whole thing has been turned into a Hindu shrine. The entrance to these massive caves is only accessable by 272 steps up the side of the hill.
Ellison's Cave (United States)
Ellison's Cave is located on Pigeon Mountain in Georgia and features the largest underground pit in the United States. The "Fantastic Pit" is 586 feet tall and it's popular to repel to the bottom. There have been three instances of serious injury or death while descending into the pit.