Millions of Mexican free-tailed bats spend the summer in Bracken Cave outside San Antonio, Texas. Like clockwork, the colony emerges from the cave each night in search of food. | USA TODAY

35K views · 248 reactions | Your kids will love this underground experience! Indiana Caverns is the largest cave in Indiana and includes an underground adventure with Ice Age bones, a 35-foot waterfall, and a boat ride. | Indiana Caverns | Facebook

🦇 Save this Carlsbad Caverns National Park guide for future planning! 📝 Facts about Carlsbad Caverns National Park, located in New Mexico! •This limestone cave was created over 250 million years ago •The bones of ice age animals such as Lions and Giant Sloths have been found at the caves entrance. •The temperature of the cave holds at a steady 56 degrees year round. •As many as 300,000 bats come from the cave each night. •The Big Room section of Carlsbad Caverns covers 8.2 acres. Making it the