Hosts Jack and Colton get up close and personal with the massive brown bears of Katmai National Park in Alaska. The guys watch bears fish for salmon and dig for clams along the Pacific Coast and camp out in the back country surrounded by bears.

Jack and Colton experience the awesome power of Mother Nature in Alaska as they kayak with whales and sea otters through Glacier Bay National Park, witness glaciers crashing into the sea and trek to get up close to a mammoth Glacier.

Going off the beaten path takes on new meaning for Jack and Colton in the “American Alps” in North Cascades National Park in Washington, as they’re pushed to the limit and forced to overcome fears in a quest to make the climb of their lives.

Goats, marmots and owls are just a few of the creatures that Jack and Colton meet as they venture through Olympic National Park. From rainforest to rocky coast to the magnificent mountains, the guys discover why Olympic is really three parks in one.

Jack and Colton trudge through miles upon miles of volcanic ash and forge a treacherous river in search of one of the most powerful volcanoes on earth. Oh, and they are on constant alert for browns bears too.

Jack and Colton head into the northland of their home state of Minnesota to live like the Voyageurs did centuries ago. If they don’t gather it or catch it, they don’t eat as they paddle their way across these awesome interconnected lakes.

Jack and Colton prepare for a possible encounter with grizzly bears as they head high into the Rockies and across the continental divide on their first back-packing adventure in Glacier National Park.

The guys have a run-in with a bear and a showdown with big horn sheep as the hit the trails and the epic Going-to-the-Sun Road of Glacier National Park.

Jack and Colton take on Old Rag, one of the most dangerous trails in Shenandoah National Park, then belay each other 110-feet straight up a rock cliff.

The guys creep and crawl for miles through the underground of Mammoth Cave National Park, and help researchers capture wild bats to track a deadly disease.

Jack and Colton trek miles through an icy cold river, then hold on for dear life while climbing one of Zion National Park’s scariest trails.

Jack and Colton saddle up and check out the land of hoodoos, then go back country camping… ultra-light with no tent. It’s just them and the creatures of the canyon floor.

The guys learn about the supervolcano that lies deep beneath the park and check out the hot spots it creates. Then they track the parks elusive wolves and other awesome wildlife.

Jack and Colton experience the power of the Yellowstone River at its own Grand Canyon, towering waterfalls, and white water rapids.

Jack and Colton trek through the land of giants in Sequoia National Park. Then it’s a face-off with fear as they take on a 150-foot climb straight up a sheer granite rock wall.

Jack and Colton head to Death Valley National Park in search of one of the most scarce resources in the park… water.

It’s a rocky ride for Colton and Jack as they explore the Chasm of Doom and climb The Eye of the Cyclops in Joshua Tree National Park.

Colton and Jack are on the island of Maui checking out Haleakala National Park. They’re flying high and riding low while exploring the house of the sun.

Jack and Colton are taking on Mauna Loa, the largest volcano on Earth, battling altitude sickness and the threat of severe weather along the way.

Colton and Jack are slogging their way through the sloughs of Everglades National Park. Then it’s a marathon kayak adventure out to one of the remote keys in the Gulf Coast.

The guys face off with Mother Nature in Pictured Rocks National Lakeshore, spending a cold winter in a snow trench before taking on a 70-foot wall of ice for a climb like none they’ve done before.

Jack and Colton are in the largest urban national park in the U.S. experiencing a canyon’s to coast adventure with mountain biking and whale watching. Then the guys hit the waves for their first surfing experience ever!

Hosts Jack Steward and Colton Smith relive some of their best wildlife encounters in the nation’s national parks.

Camping in the national parks is always an interesting experience for Colton and Jack, especially when it comes to finding resources for food and water and a place to sleep.

From the remote wilds of Alaska to the high Rocky Mountains of Montana and Wyoming, there’s one animal that draws people to the national parks. Today, Jack and Colton revisit some of their greatest bear encounters and experiences.

Colton and Jack have crisscrossed the country for some truly epic national park adventures from rafting the mighty Yellowstone River to the deep underground of Mammoth Cave and hiking to the top of the largest volcano in the world in Hawaii.

The guys visit one of the last undeveloped beaches on the Atlantic coast. Cumberland Island National Seashore is home to tons of wildlife and Jack and Colton see it all from manatees to manta rays, and alligators to wild horses.

Dry Tortugas National Park has Colton and Jack taking their exploration into the sea, diving deep to check one of the largest coral reefs in the world and the marine life that call it home, from stingrays, to goliath grouper and even nurse sharks.

Jack and Colton head deep into the woods to learn about the amazing life of black bears, and then they search for some of the tiniest inhabitants of the Great Smokies. Finally, it’s a lung-busting hike to the top of a Smoky Mountain peak.

Colton and Jack hit the beach for a raucous wind surfing race. Then it’s hush-hush in the hatching room where the guys see endangered Kemp’s Ridley sea turtles emerged fromtheir shells before making their own mad dash to the ocean.

Hosts Jack Steward and Colton Smith explore the iconic sea caves carved into the cliffs of Lake Superior BY both kayaks and below the surface in scuba gear. Plus they check out a 100 year-old shipwreck sunk by Superior’s wrath.

Jungle Jack Hanna joins the guys on a story-filled hike through bear country. The guys get a good look at a grizzly and take on some of the roughest whitewater rapids they’ve ever experienced.

Jack and Colton are in Denali National Park traversing a crevasse-laden glacier to take on their first Alaskan Peak!

Remote wilderness takes on a whole new meaning as Colton and Jack take on the white-water ride of their lives in Alaska’s Aniakchak National Monument.

Lava caves and cinder buttes are giving Jack and Colton a park experience like no other as they explore the strangest 75 square miles in North America, in Idaho.

Colton and Jack are taking on Denali and hoping to spot all of the parks Big Five. Plus, they’re spending some time with the Denali sled dogs and the pups in training.

Jack and Colton team with U.S. Secretary of the Interior Sally Jewell for hike up Mount Rainier.

Jack and Colton are in Grand Teton National Park for the biggest challenge of their lives… climbing the Grand!

Jack and Colton are checking out The Rockies the same way visitors have for centuries… by hoof and by foot. Then they face an unexpected challenge while rock climbing a rock formation called the Twin Owls.

The guys hit the cliffs and canyons of Capitol Reef National Park in Utah to explore the history of the first settlers who called the land home.

Colton and Jack head to Maine’s Rocky Coast for a taste of Acadia National Park. Spotting seals and dolphins to Bald Eagles and Peregrine Falcons… it’s an unforgettable wildlife adventure down east!

Colton and Jack are road trippin’ through South Dakota. After a stop in Custer State Park, they’ll do their best not to get stuck in Jewell Cave or lost in Badlands National Park.

Jack and Colton mess with Texas and Texas strikes back. Rattlesnakes, intense heat and the Rio Grande’s Rock Slide give the guys all they can handle in the Lone Star State.

Colton and Jack are on exploring the island of St. Croix both above and below the surface. After lighting up the night in a bioluminescent bay they head into another kind of darkness… a wall dive into the abyss.

Jack and Colton are in Virgin Islands National Park in St. John, USVI. After hiking through the islands history, they’ll trade in sunshine for moonlight to take on their first night scuba dive.

Mother Nature and elevation really push the guys to their limits while trekking up the tallest peak in Great Basin National Park. After that, it’s all downhill and underground when they go on a wild caving mission for the park.

Colton and Jack are in for some ups and down while visiting Yosemite National Park in California. And they get their hands while learning about the parks efforts to reduce trash going to landfill.

From grizzly bears and bison to salamanders and baby sea turtles, Jack and Colton come across all sizes of animals during their adventures. It’s a look back at all the best of big and small wildlife in our national parks.

The varied landscapes of the national parks push Jack and Colton to the limit as they look back at some of their greatest adventures.

Whether it’s shooting rapids, diving deep, kayaking caves or climbing ice it’s easy to get a little wet and wild in the national parks. Jack and Colton look back at some of the best water adventures.

Colton and Jack look back on their best adventures featuring California’s national parks. Included: Whale-watching, surfing and the Chasm of Doom.

It is destination fire and ice as Jack and Colton head to Yellowstone National Park for a winter adventure in the Rockies.