This 317-ton walkable art installation is an homage to Korea's "City of Steel."

A beautiful modern church dedicated to the teleporting patron saint of Andorra.

This 18th-century water provider for Aranjuez was refurbished in 2013 only to be neglected again.

Where Kevin Eastman and Peter Laird created their "heroes in a half shell" and founded Mirage Studios.

There's light and a dreamlike panorama at the end of this tunnel.

This museum dedicated to the history of the medical bone trade and human osteology.

Apparently, the whole cosmos emanates from this plain concrete tower.

The island where one woman reigned as a "queen" over 30-odd Japanese soldiers who refused to believe that WWII had ended.

This ruined fort and statue are a testament to the last king of Kaua‘i’s savvy diplomacy skills, which briefly brought Russians to Hawai‘i.

This Alaskan town appoints the general store's resident feline as honorary mayor.

Kayak out to a floating restroom.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

In 2018, Pohoiki Road was severed by lava flowing from the eruption of Kilauea.

Located in the world's highest-altitude Dark Sky Community, this observatory welcomes amateur and professional astronomers alike.

It's safe—and permitted—to walk across these twin natural sandstone arches.

Could this grave be the true resting place of legendary gunfighter "Doc" Holliday? Unclear.

Once the extravagant escape of the Ford family, this enigmatic ruin now stands as a haunting reminder of its former glory.

Enjoy the waters of this half-moon-shaped natural pool surrounded by breathtaking scenery.

A dozen U.S. presidents have stayed at the historic resort, which was known as James Buchanan’s “Summer White House” from 1857-1861.

Stuck in a bygone era, the oldest subterranean shopping street in Japan hides beneath the popular Asakusa district of Tokyo.

Once home to a thriving oil industry, this town now sits eerily abandoned.

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

The overgrown remains of one of the premier auto-racing speedways in the Midwest—and also one of the most deadly.

An idyllic mineral hot springs facility with a more-than checkered past.