The unforgiving Border Swamp that resides between the Texas - Louisiana state lines is home to not only an infamous history, but wild creatures as well. Episode 5 of 5 season 3.

The unforgiving Border Swamp that resides between the Texas - Louisiana state lines is home to not only an infamous history, but wild creatures as well. Episode 5 of 5 season 3.

Texas is the frontline for a summer invasion: millions of free-tailed bats descend upon Bracken Cave, creating the largest bat colony on Planet Earth. Episode 4 of 5 season 3.

Texas is the frontline for a summer invasion: millions of free-tailed bats descend upon Bracken Cave, creating the largest bat colony on Planet Earth. Episode 4 of 5 season 3.

Texas is the frontline for a summer invasion: millions of free-tailed bats descend upon Bracken Cave, creating the largest bat colony on Planet Earth. Episode 4 of 5 season 3.

Texas is the frontline for a summer invasion: millions of free-tailed bats descend upon Bracken Cave, creating the largest bat colony on Planet Earth. Episode 4 of 5 season 3.

Texas is the frontline for a summer invasion: millions of free-tailed bats descend upon Bracken Cave, creating the largest bat colony on Planet Earth. Episode 4 of 5 season 3.

The most beautiful secret in Texas hides along the border, where the Rio Grande meets mountains: Big Bend. This desert Eden has long thrived, concealed until now. Episode 3 of 5 season 3.

The most beautiful secret in Texas hides along the border, where the Rio Grande meets mountains: Big Bend. This desert Eden has long thrived, concealed until now. Episode 3 of 5 season 3.

The most beautiful secret in Texas hides along the border, where the Rio Grande meets mountains: Big Bend. This desert Eden has long thrived, concealed until now. Episode 3 of 5 season 3.

The most beautiful secret in Texas hides along the border, where the Rio Grande meets mountains: Big Bend. This desert Eden has long thrived, concealed until now. Episode 3 of 5 season 3.

The most beautiful secret in Texas hides along the border, where the Rio Grande meets mountains: Big Bend. This desert Eden has long thrived, concealed until now. Episode 3 of 5 season 3.

The rolling plains of the Texas panhandle belong to more than cattle and cowboys- this is also the land of claw, spine, and fang. Episode 2 of 5 season 3.

The rolling plains of the Texas panhandle belong to more than cattle and cowboys- this is also the land of claw, spine, and fang. Episode 2 of 5 season 3.

The rolling plains of the Texas panhandle belong to more than cattle and cowboys- this is also the land of claw, spine, and fang. Episode 2 of 5 season 3.

The rolling plains of the Texas panhandle belong to more than cattle and cowboys- this is also the land of claw, spine, and fang. Episode 2 of 5 season 3.

The rolling plains of the Texas panhandle belong to more than cattle and cowboys- this is also the land of claw, spine, and fang. Episode 2 of 5 season 3.

Between Death Valley's searing temperatures and the alpine air of Mount Whitney lies a 146-mile stretch that only the hardiest can survive. Episode 1 of 5 season 3.

Between Death Valley's searing temperatures and the alpine air of Mount Whitney lies a 146-mile stretch that only the hardiest can survive. Episode 1 of 5 season 3.

Between Death Valley's searing temperatures and the alpine air of Mount Whitney lies a 146-mile stretch that only the hardiest can survive. Episode 1 of 5 season 3.

Between Death Valley's searing temperatures and the alpine air of Mount Whitney lies a 146-mile stretch that only the hardiest can survive. Episode 1 of 5 season 3.

Between Death Valley's searing temperatures and the alpine air of Mount Whitney lies a 146-mile stretch that only the hardiest can survive. Episode 1 of 5 season 3.

The High Cascades conceal the most active volcanoes in the Lower 48. These sleeping giants have the potential to erupt at any time. Episode 1 of 5 season 1.

The High Cascades conceal the most active volcanoes in the Lower 48. These sleeping giants have the potential to erupt at any time. Episode 1 of 5 season 1.

The High Cascades conceal the most active volcanoes in the Lower 48. These sleeping giants have the potential to erupt at any time. Episode 1 of 5 season 1.

The High Cascades conceal the most active volcanoes in the Lower 48. These sleeping giants have the potential to erupt at any time. Episode 1 of 5 season 1.

The High Cascades conceal the most active volcanoes in the Lower 48. These sleeping giants have the potential to erupt at any time. Episode 1 of 5 season 1.

America. The Beautiful. The Adirondacks (USA, 2015 30') New York City's Central Park; and a whitewater rafting adventure on the Hudson River Gorge. 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.

America. The Beautiful. Yellowstone (USA, 2015 30') Wildlife filmmakers capture footage of a grizzly bear and pack of once-endangered northern Rocky Mountain wolves competing for food in Yellowstone National Park.

America. The Beautiful. The Caribbean (USA, 2015 30') 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.

America. The Beautiful. Florida Keys (USA, 2015 30') 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.

America. The Beautiful. Columbia River Gorge (USA, 2015 30') Professional kayakers take on the boiling rapids and brutal falls along the Columbia River Gorge.

America. The Beautiful. Monument Valley (USA, 2015 30') A mountain-biking legend bounces and glides near-vertical rock faces in Sedona, Arizona, 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.

America. The Beautiful. Yosemite (USA, 2015 30') 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.

America. The Beautiful. Canyonlands (USA, 2015 30') Utah's most awe-inspiring sites are toured in unique ways. Included: Mineral Canyon; a historic cattle ranch; and the crumbling ruins of an ancient civilisation.