By Kary Vannice

Some of Mexico’s most fantastical and fascinating outdoor pursuits aren’t actually outdoors but underground. With over 7,000 recorded cave systems scattered across the country, Mexico boasts some of the most extensive and awe-inspiring underground networks in the world. Beneath its amazing surface lies an even more mesmerizing world waiting to be discovered – a labyrinth of caves, caverns, and underground rivers that weave throughout Mexico, telling the earth’s ancient origin story.

Mexico is, of course, well known for its diverse landscape, from lush green jungles to towering blue mountains, but it’s her vast subterranean realm that can truly captivate the adventurous spirit. Each cave system tells a story of geological evolution, carved out over millions of years by relentless forces of nature.

One of Mexico’s most iconic cave systems is the cenotes of the Yucatán Peninsula. Cenotes are ancient sinkholes formed by the collapse of limestone bedrock to reveal a hidden world of crystal-clear waters and intricate caverns. Exploring the cenotes offers a unique opportunity to swim, snorkel, or dive amidst massive stalactites and stalagmites as shafts of sunlight pour down from surface openings, lighting up the subterranean landscape. If you’re visiting the Yucatán, you can find many guided tours that will safely allow you to experience these hidden wonders.

Venturing further into Mexico’s underground realm, you can explore the sprawling cave systems of the Sierra Madre Oriental on the eastern side of the country. Here, limestone cliffs give way to a network of caverns adorned with stunning formations, including delicate helictites, which, unlike stalactites and stalagmites, look like they were formed in zero gravity. They can extend horizontally or even diagonally across the cave’s surface often ending up looking like sea coral growing out of the depths. Also, in this area, you will find the Cave of Swallows, one of the largest vertical cave shafts in the world. It plunges over 1,200 feet straight down for anyone seeking an adrenaline rush by rappelling a quarter of a mile down into the black abyss.

If you’re looking for a more immersive experience, the Rio Secreto in the Riviera Maya provides a journey through an underground river system that flows beneath the pristine jungle above. Kayaking or floating through the subterranean waterways reveals a hidden world of ancient rock formations and subaqueous chambers where the echoes of dripping water create a symphony of sound that reverberates through the caverns.

But perhaps one of Mexico’s most extraordinary underground landscapes lies deep beneath the surface of Naica, Chihuahua – the Cave of the Crystals. Located 300 meters within the Naica Mine, this otherworldly cavern is renowned for its gigantic gypsum crystals. Some of the crystals inside the cave are as tall as a 4-story building and weigh over 50 tons. Humans in this environment look like tiny ants surrounded by perfectly formed, crystal clear prisms and luminescent shafts of light. The cave’s extreme conditions, with temperatures reaching up to 58°C (136°F), along with humidity levels nearing 100%, created the perfect environment for forming these monumental crystals over thousands of years.

So breathtakingly beautiful, this true marvel of the underground world was featured on the Discovery and History Channels and the Outdoor Life Network in Canada. These programs offered a rare glimpse into this surreal underworld that seems more like a scene from science fiction than reality. Unfortunately, unlike many other underground wonders in Mexico, your only opportunity to experience this mystical landscape is on TV. Discovered initially as part of a mining exploration that required pumps to keep the underground water from filling the chamber, the caves were allowed to re-flood when mining operations ceased in October of 2015. Nevertheless, the mere existence of this extraordinary ecosystem serves as a testament to the incredible geological diversity and untold mysteries that lie beneath Mexico’s surface.

Mexico’s expansive cave systems offer a gateway to a realm where time stands still, and the earth reveals its hidden treasures. Each unique cave system tells a story of geological wonder and cultural significance. You just have to be adventurous enough to look below the surface.