A strange cave freezes in the summer and melts in the winter; a massive sand dune swallows a small child in an instant.

When an infamous pirate city, Port Royal, Jamaica, sunk into the sea after a massive earthquake, a wealthy pirate's treasure may have disappeared with it; a hunt for the legendary lost pirate treasure of Henry Morgan.

Millions of dollars of stolen Gold Rush treasure is rumored to have been stashed in a cave in Northern California; the search for the legendary treasure.