Join the Trio to go underground in four countries on two continents. Descend deep into the Earth to taste the walls of a 700-year old salt mine. Venture through the creepy depths of a labyrinth. Explore a tiny cave in a tiny boat. Check out a graphite mine and get super muddy in the wildest part of one of the largest caves in Texas. There's a lot to do underground, so grab your passport (and your headlamp) and let's go!
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