Carlsbad Caverns National Park in southeastern New Mexico is home to 119 known caves, including North America's largest cave chamber, the Big Room.

Mexico. It is a true geode: a cave completely covered with transparent selenite crystals (that is extremely pure gypsum), some of which are more than 12 m in length and by far the biggest ones in the ...

Related: Cave of Crystals: The deadly cavern in Mexico dubbed 'the Sistine Chapel ... Leftover minerals from this acid bath gave rise to gypsum crystals, which formed giant blocks and delicate ...