It looks like Superman’s Fortress of Solitude and is nearly as hard to get into, but that hasn’t stopped explorers from uncovering new secrets in and around Mexico’s deep, deadly hot Cave of Crystals.
Giant Crystal Caves Yield New “Ice Palace,” More
It looks like Superman’s Fortress of Solitude and is nearly as hard to get into, but that hasn’t stopped explorers from uncovering new secrets in and around Mexico’s deep, deadly hot Cave of Crystals.