It's hard to believe the dizzying patterns covering this abandoned mine are completely natural.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

Why walk on this historical site when you can zoom down instead?

The remains of a doomed Antarctic plane, buried beneath layers of ice and snow, await those willing to do a bit of digging.

Space program, pneumatics and more, bits and pieces, for movie sets or the common man.

Wondrous stalactites house thousands of bats in these African caves.

Spanning over 10,000 square miles, this ancient salt pan is one of the largest on the planet.

A magically clear, blue river that seems to spring from nowhere.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

Train debris from the deadliest avalanche in United States history can still be found in the ravine where so many perished.

One of the most remote lodges in the Amazon offers rare wildlife encounters and undisturbed views of the Peruvian rainforest.

A remarkable lava formation encloses a line of Buddhist statues that can't be accurately counted, according to local mythology.

This museum collects over a century of automobile history including the iconic car from The Muppet Movie.

The first artificial white water river course in North America cuts right through an Indiana city.

France's high-tech, future-themed amusement park.

The only substantial part of Nazi Germany's formidable defensive line through Northern Italy that survives today, largely intact.

Few other hotels can rival the grandeur of the Castle in the Rockies.

This super steep hike ascends 2,000 feet in less than a mile.

Despite a legend that says this highest peak in Oregon was climbed in high heels scores of people have died on its slopes.

The king of U.S. high points towers over every other peak on the continent.

The highest point in Washington state is a volcano covered in glaciers.

A breathtaking canyon offers stunning views and frightful pathways through an ecological paradise.

This sculpture is an instrument played by the swell of the seas.

This nine-story building can be played like an instrument.