Exploring Rio Secreto, the Riviera Maya's Amazing Underground River

One of Rio Secreto’s Many Dazzling CavesThe Riviera Maya’s Amazing Underground RiverCaves have held a strange, primordial allure over me ever since I first read about Tom Sawyer’s adventures in Mark Twain’s classic adventure novel as a boy.From the cliffs of Petra to the Milodon Caves of Patagonia, exploring them has always made me feel like I was part-caveman, part-astronaut, venturing into places both ancient and unknown.