Join Discovery as we explore five of America's most extreme destinations: Denali, Alaska (highest peak); Death Valley, California (hottest, driest, and lowest); Prospect Creek, Alaska (coldest); Mt. Waialeale, Hawaii (wettest); and Paradise Visitors Center on Mount Rainier (snowiest).

International mysteries, vintage maps, hidden treasure… Explorers Justin and Emiliano are on the case.

We've selected 5 unforgettable hiking vacations sure to lead you into the thick of your destination.

Explore Alaska on an RV road trip, seeing Denali, Fairbanks, Valdez and everything in between.

Halloween is here, which means now is the time to explore the creepiest places in the world. What we weren't quite prepared for, though, was just how many terrifying churches made from human remains there were out there. These five sacred buildings are straight out of a doom-metal video.

There's a strange sight called the Mima Mounds that stretches for hundreds of miles. But nobody knows what caused them. Learn more about this mysterious place in Washington.

In the northernmost region of Finland, Lapland is the place to be to see a real winter wonderland... and Santa Claus!

Join Discovery about 350 miles off the coast of Australia where we visit Ball's Pyramid. At 1,844 feet above the Pacific, it's the world's tallest sea stack; it's also one of the last dry remnants of a sunken content. The monolithic natural structure formed after years of erosion from an ancient shield volcano about 7 million years ago, and it's home to what is arguably the rarest insect in the world.

For more than a century, adventurous souls have sought the Lost Dutchman Mine, and since 1891, more than a hundred people have claimed to find it. But the mine remains shrouded in mystery, so much so that it might not exist at all.

The yaupon holly, North America’s only native plant that contains caffeine, creates a powerful elixir known as the Black Drink.

In Juneau, Alaska, you can take a walk not just on, but in a glacier. That's right — inside the partially hollow Mendenhall Glacier is a surreal landscape of breathtakingly bright blue ice caves, accessible via hike, kayak, and a climb over the ice. You better get there soon, though, because this natural marvel is melting ... fast.

The world is full of ancient stone monuments, but have you heard about the mind-blowing underground churches of Lalibela, Ethiopia?

Derinkuyu is an ancient Turkish city that extends 250 feet underground and is large enough to house 20,000 people. Built as protection against invaders more than 2,100 years ago, the city had fresh water, stables, wineries and oil presses.

The African country of Madagascar boasts plenty of wildlife, but it also features the world's largest stone forest. Some of the limestone peaks reach as high as 2,600 feet, and the nature reserve is home to several unique endangered plants and animals including lemurs.

Most people know that Tanzania is home of the Serengeti and an amazing diversity of wildlife. The country is made up of 430 species of wildlife and 17 national parks. But did you know that it’s where 51 million people call home as well?