1. Cueva de los Cristales (Mexico)
Discovered in 2000 by two brothers who were drilling below the Naica mine near Chihuahua, the Cave of Crystals is a glittering spectacle with temperatures that can reach up to 112 degrees. Many of the crystals, which are estimated to be about 600,000 years old, can be several feet thick, and the smaller ones are razor sharp. Forget diamonds; if you really love a woman, take her to a cave filled with crystals bigger than her wildest dreams.
2. Waitomo Glowworm Cave (New Zealand)
Formed over 30 million years ago, this cave is one of the most brilliant displays of bioluminescence on Earth. Thousands of glowworms, which are native to New Zealand, hang from the walls of the cave from strands of silk and use their dazzling blue light to attract prey. You may not ever find a cavern filled with fairies, but this is pretty darn close.
3. Grotto Azzurra (Italy)
If you’re ever near Capri, Italy, you NEED to take a trip to the Blue Grotto. Once thought to be inhabited by sirens and devils, the cave is known for its radiant blue water. When the sunlight enters the cave through an underwater entrance, the water filters out the red light and leaves only the blue light to illuminate the cavern. The result is an incredible phenomenon that leaves no need for color enhancements on all the photos you’ll take there.
4. Vatnajökull Glacier Cave (Iceland)
Formed entirely out of ice, glacier caves are best to visit in the autumn and winter, when the ice isn’t as likely to collapse and the glaciers don’t move as quickly. Many of them also take on a bright blue color, which is common in parts of glaciers (such as the underside, or in this case, the inside) which have not been turned white by the sun’s UV rays. Would you be daring enough to venture inside a cave that could melt?
5. Phraya Nakhon Cave (Thailand)
Inside the Khao Sam Roi Yot National Park is the Phraya Nakhon: an incredible cave with an interesting history behind it. Sunlight filters through the top of the structure’s collapsed ceiling, illuminating the Kuha Karuhas pavilion that was originally built in 1890 for King Chulalongkorn. Since its construction, other local kings have visited the cave and left their signatures on its walls. This is one cave that is majestic in every sense of the word.