• Tagged adventure, cave, cavers, caving, exploration, extreme sports, Hang Son Doong, karst, Phong Nha Cave, Phong Nha-Kẻ Bảng, Phong Nha-Ke Bang National Park, Phong Nha–Kẻ Bàng karst, Son Doong Cave, stalactites, stalagmites, Thien Duong Cave, Tien Son Cave, Vietnam

Hidden in the thick tropical forest of Vietnam is a land of phenomenal caves. Phong Nha-Ke Bang National Park contains the oldest major karst area in Asia; the karst is believed to have formed 400 million years ago, during the Palaeozoic era, With every cave discovery, that cave is considered the largest and longest in Phong Nha-Ke Bang, only to learn later that yet another even more massive cave has been found. This national park is home to the largest cave in the world and is said to be the home of the many of the world’s most beautiful caves. It’s famous for its cave and grotto systems, about 300 caves and grottos, of which only 20 have been surveyed by Vietnamese and British scientists. UNESCO named it a World Heritage Site for its geological values. Spectacular stalactites and stalagmites create an underground fairy-tale-like world where formations look like the caves possess jagged teeth or home to strangely alien trees. Visitors to Phong Nha-Ke Bang National Park most often visit the massive Paradise Cave and huge Phong Nha Cave as seen below. If you don’t expect to ever travel to Vietnam, then here is a virtual trip to see the mysterious and massive world hidden beneath Phong Nha-Ke Bang National Park . [39 Photos, 2 Videos]

• Tagged adrenaline junkies, adrenaline rush, canoe, extreme kayaking, extreme sports, Great Falls National Park, kayak, kayakers, kayaking, Oregon, rivers, waterfall, whitewater, whitewater kayaking, whitewater river rapids

There are many types of kayaking which can include paddling down gently moving water, but these kayakers are into demanding, dangerous whitewater. If trapping your legs into the cockpit and kayaking over insanely treacherous whitewater river rapids is not enough of an extreme adventure sport, then how about going over a waterfall in a kayak? Professional kayakers drop hundreds of feet going over falls. Extreme sports photographers captured these whitewater kayakers river running, rolling, creeking, playboating and during other extreme kayaking. We’re not quite sure if these kayakers are on drugs . . . or need to be. Or maybe all these adrenaline junkies need is the natural drug, an adrenaline rush? [45 Photos & 5 Videos]

• Tagged adrenaline junkies, adrenaline rush, BASE jump, cliffs, extreme sports, insane roads, Kjerag cliffs, mountains, nature, Norway, photography, photos, pics, pictures, places, Preacher's Pulpit, Preikestolen, Pulpit Rock, The Troll's Tongue, travel, Troll Mountains, Troll Wall, Trollveggen

Norway has absolutely beautiful landscapes, including crazy cliffs that call to people to climb up them and then BASE jump off the top. Here’s a look at some of those incredible cliffs as well as insanely dangerous switchback roads to get to those amazing cliffs in Norway. Thrillseekers, photographers, hikers and climbers take in these majestic views of nature. And then, there’s BASE jumpers who have a much more extreme need for adrenaline. Charles Lindbergh once said of his adrenaline rush, “It is the greatest shot of adrenaline to be doing what you have wanted to do so badly. You almost feel like you could fly without the plane.” Here in Norway, as if they’ve turned into Superman, some adrenaline junkies do fly without a plane.
[33 Photos]