State: New Mexico
Recreational visits (2016): 466,773
If you're afraid of bats, the 117 caves that make up Carlsbad Caverns probably aren't for you. In 2005, the park had a resident colony of roughly 400,000 Brazilian free-tailed bats.
#39. Carlsbad Caverns National Park
Break out the hiking books, dust off your old tent and get ready for adventure: National Park Week is upon us. To celebrate, let's take a look…