Fortress of Giant Gypsum Swords
Discovered in 2000 by miners in Chihuahua, this cave sits 980 feet underground. Heated by magma below, temperatures reach 136 degrees Fahrenheit with 90 percent humidity, allowing gypsum crystals to grow up to 39 feet long over 500,000 years.
Border blunders and geographical glitches
Nature's optical illusions and strange landscapes
Subterranean secrets and deep wonders
Bizarre settlements and town name eccentricities
schopenhauer Actun Tunichil Muknal is a cave containing ancient Maya archaeological treasures, including calcified human skeletons.
Giant crystals: The Cave of the Crystals in Naica, Mexico, is so hot that humans can only survive inside for ten minutes without specialized suits.
schopenhauer Mammoth Cave National Park protects the longest known cave system on Earth, spanning hundreds of miles of underground passages.
A natural underground chamber or series of chambers, typically in a hillside or cliff. Mammoth Cave in Kentucky is the world's longest known cave system, spanning more than 400 miles.
What is the name of the famous calcified skeleton found inside Belize's Actun Tunichil Muknal cave?
schopenhauer Drag your flashlight to discover North America's weirdest underground secrets.
Approximately how many miles of passageways have been mapped in Kentucky's Mammoth Cave?
Which famous ocean explorer popularized the Great Blue Hole of Belize by declaring it one of the top scuba diving sites?
What mineral forms the giant, sword-like crystals in the Cave of the Crystals in Naica, Mexico?
Why is the environment inside Mexico's Naica Crystal Cave dangerously hostile to humans without protective gear?
Actun Tunichil Muknal cave in Belize was primarily used by which ancient civilization for religious rituals?
Which US state is home to Mammoth Cave, the longest recorded cave system in the world?
What geological event during the last ice age caused the formation of the Great Blue Hole of Belize?