An extreme cave diver's adventure in Florida's Jackson Blue Spring. Also: An Afghanistan war veteran explores a personal connection to a Civil War-era shipwreck in Tampa; and fires are started in the Corkscrew Swamp Sanctuary in an effort to preserve the ancient habitats of alligators, wood storks and an elusive panther.
Professional kayakers take on the boiling rapids and brutal falls along the Columbia River Gorge; and the dangerous and mysterious ice caves of Mt. Hood are explored. Also: a look at what makes the bizarre and natural phenomenon Crater Lake a place like none else on Earth.
A marine researcher works to solve the mystery behind the bioluminescence in the water of Vieques' Mosquito Bay; the operator of an extreme ecotourism company battles a dangerous underground river in an epic cave near Arecibo Observatory in Puerto Rico; and in St. John, a little-known snorkeling spot teems with colorful tropical fish and underwater vegetation.
NYC's Central Park; and a whitewater rafting adventure on the Hudson River Gorge in the Adirondacks, N.Y. Also: A 17-year-old glider pilot takes a long-distance flight over the wilderness; and an athlete attempts to climb up the Shawangunk Mountains.
A mountain-biking legend bounces and glides near-vertical rock faces in Sedona, Ariz.; a photographer captures stunning visuals in Monument Valley. Also: exploring one woman's efforts to protect one of the country's last-known herds of wild horses.
Wildlife filmmakers capture footage of a grizzly bear and pack of once-endangered northern Rocky Mountain wolves competing for food in Yellowstone National Park. Also: ice climbing Montana's Hyalite Canyon; and rock climbing Wyoming's Devils Tower.
A travel series devoted to unique views of the most awe-inspiring places in the U.S. begins in California. Included: Two hang glider pilots launch themselves off Glacier Point for a spectacular look at the Yosemite Valley; a marine biologist weaves herself through the kelp forests of the Channel Islands; and an arborist scales one of the tallest trees in a strand of coastal redwoods.