Do you fancy yourself a regular Indiana Jones, or are you simply looking for a little more adventure in your life? Either way, grab your whip and hold onto your hat, because these 15 caves are spectacular, spooky, and exploration-ready. Ogle mysterious rock formations, vast underground lakes, and endless labyrinthine passages that lead you deep under the earth.
Whether you're seeking more advanced spelunking or a family-friendly tour, these US caves will take your breath away. Click on to see more.