Unknown to many, this sparkling turquoise lake hides amid Oregon's snowcapped mountains.

This charmingly homemade amusement park has been growing for 40 years.

Hollowed out cedar log tubs set in an ancient towering forest.

A glacier pocked with ice caves and surrounded by rainforests.

This former quarry is now a picturesque gorge that hides a sunken lake.

Gorgeous cave resemble a winter wonderland.

The ravine where Jesse James supposedly performed an impossible jump to evade capture.

Not one, not two, but three natural bridges remain in this captivating spot post-sinkhole.

In the middle of a suburban Denver neighborhood is a cave that once provided solace for a prominent Ute chief and his family.

A 4,500-year-old forest is slowly being revealed from beneath the sands of a Welsh beach.

270 million year-old forest of stone.

A sulfuric martian landscape that looks far better than it smells.

This beautiful grotto is one of those places where you can't believe you're just outside Austin.

A once-thriving hotel in the Swiss Alps couldn't compete with climate change.

Submerged trees jut ghost-like out of an idyllic turquoise mountain lake.

This tumultuous Icelandic lava field looks so alien European researchers want to use it as a stand-in for Mars.

A lonely beacon, precariously perched atop a remote sliver of rock.

A historic observatory precariously perched at the "Top of Europe."

A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

The largest dune field in the Mojave offers a chance of hearing the 'singing sands.'

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

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

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

From the sky, a kaleidoscope of color brightens the grey landscape of the San Francisco Bay.