This abandoned five-star hotel is now a five-star urban exploration destination.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

Nature's biggest mammal swims in landlocked Oklahoma.

A few dilapidated structures are all that remain of this deserted former silver mining town.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

An unfinished tomb carved into a giant boulder in the Arabian Desert.

An artsy hidden staircase leads to breathtaking views of San Francisco.

Defying all odds, this lonely little tree found a home on a log sticking out of a Canadian lake.

This odd Chilean waterfall-cano hotel must be entered via a rope bridge.

Railways may have forged this quintet of lovely tunnels, but now they are open to hikers.

Walking by this fence is like strolling along a portal to various fictional worlds.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

Tucked in the back of this amazing antique store is an important piece of medical history.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

The show's fictional Korean medical camp was created in the Santa Monica hills.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Erosion and time have created a naturally-formed water park.

This wondrous waterfall rushing down a green-covered mountain wasn't discovered until 2010.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

A natural gas leak provides a flickering flame beneath a waterfall.

A tiny red pebble marks what may be the quietest outdoor spot in the United States.

Off-limits and full of venomous pit vipers, Brazil’s Snake Island has a frighteningly apt nickname.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.