Mountain known by the Tillamook Tribe as "the place of the supreme deity."

A massive volcanic plug is now a protected area that hosts a number of bird species.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

This quiet park's strange sedimentary spires were named after Kodak's color film.

Rising out of miles of farmland, these buttes are sometimes called the world's smallest mountain range.

A raised boardwalk winds through a thicket of stunted, century-old trees no more than nine feet tall.

The only diamond mine in the world where you can keep what you find.

A deteriorating 1990s Girl Scout camp in a beautiful lush park on Lake Ontario.

Foragers once flocked to this big beautiful bayou to hunt for pearls.

According to local lore, this narrow passageway through two large rocks was accidentally created by the devil himself.

On the Oregon coast there is a natural hole that seems to be draining the sea.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

This faux-seedy Japanese arcade is made up to look like a maze of alleys straight out of a cyberpunk dystopia.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

An eerie, derelict amusement park in Berlin.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

The world's only museum devoted to the wonders of fluorescence.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

An exquisite tunnel of cascading flowers.

Abandoned railway line circling the city of Paris.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."