Ever wonder what it's like alone at midnight in the depths of a vast marsh, or thought of stumbling into a roiling geyser field in the dark? What happens when you get swept along for miles in a flooded river without an exit--or explore a prehistoric swamp with predators left over from the Cretaceous? How can you sense an Amazon rainforest breathing? Have you watched a great ancient waterfall cease forever in less than a day? Does the Jersey Devil...