After sitting abandoned for decades, this historic mine is now the only publicly accessible chalk room and pillar mine in North America.

A 100-year-old Japanese command center is now a unique underground university walkway with periodic exhibits.

Erosion has transformed this sandstone boulder into a massive dune-filled cavern.

Once a thriving town of 100, Argonne was abandoned around 1970.

Hidden in a cave on a small Taiwanese island, a stalagmite reported to look like the bodhisattva Guanyin.

In eastern Oregon, two mineral hot springs sit along the Malheur river.

A relatively young Buddhist temple on hilltop, dedicated to a statue relocated from Mount Atago.

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

A massive sea stack famous for its appearance in The Goonies.

This gorgeous beach hides behind two headlands in Oregon's Ecola State Park.

The lush coastal city of Astoria is riddled with forgotten secret sidewalks.

100-year-old shipwreck you can walk up to at low tide.

This frequently-photographed waterfall takes only a short hike to visit.

Legend holds that the Ancient Greek goddess of love once bathed in the waters of this grotto.

Tiny horses tethered to antique rings are scattered around the city.

Not-so-fearsome tiny trolls live under this wooden train trestle in Portland.

These secretive tunnels were once the site of a Royal Air Force fuel reserve depot.

A public urinal so pretty, it was declared a national monument.

A monumental toilet that is also host to rare plants.

Come for the whole sides of slow-roasted lamb, stay for the regional Kurdish specialties.

Homesick Syrian refugees head to this restaurant for a taste of Damascus.

Saint Borromeo often prayed in this austere crypt during the 16th century.

An abandoned relic of the city's failed experiment with below ground transit.

A crumbling ghost town on the South Dakota prairie.