13. Swim the Cave of the Crystal Sepulchre
There is no surer way to get that once-in-a-lifetime Indiana Jones feeling than by swimming-wading-squeezing-crawling-hiking a half mile deep into the Aktun Tunichil Muknal in Belize. In the ATM caves, officials have left ancient bones, pots, and other artifacts in situ, instead of hauling them off to labs and museums. The crystal sepulchre is actually the full skeleton of 1000-year-old human sacrifice, covered in calcite crystals that sparkle in the light of your headlamp. ($110 day trip; $280 overnight; pacztours.net)
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