Son Doong Cave is the largest and most unexplored cave in the world, with a depth of 150 meters and a length of 5.6 miles.
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The activity of caving is not illegal anywhere in the US. Access to caves are often restricted in some manner and some activities inside any cave is illegal. For instance, disturbing Indian burial sites can get you more prison time than murdering someone.
Cave water is usually not good to drink or to use in a carbide light. High energy foods that won't crush are a good choice. Remember to carry out all trash.
#1: United States Caves (45,000)Stretching from sea to shining sea, the United States harbors an estimated 45,000+ caves, the product of millions of years of geology at work. The country's varying terrains — limestone-rich regions, rugged mountains, and desert areas — offer a diverse array of caves.