A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

This angular Dwarven tunnel cuts through a mountainside in Glacier National Park.

The only road through the heart of Glacier National Park.

Houses are tucked between, on, and underneath giant boulders.

More than 250 sakes are available in an izakaya hidden in the basement of a Midtown office building.

The last remaining predreadnought battleship in the world has been a museum for nearly a century.

Some of New York's best tacos can be found in the back of an unassuming bodega in Queens.

These decaying bridges 1,000 feet high are a reminder of the skill it took to cross the Colorado Rockies by rail.

An indigenous ethnobotanist runs this brunch spot celebrating Australia’s native flavors.

Behind a modern brick exterior lies the oldest continuously-operating lunch-car diner in the United States.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

This ancient rock shelter features cave art and is one of the most culturally important sites in the country.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

The world-record holder for the longest bridge stretching continuously over water.

The "Bridge Over the Atlantic" lets you cross the waterway in mere seconds.

The last SR-71 ever constructed.

Over a thousand feet beneath the Detroit streets is a subterranean metropolis few are allowed to enter.

A rare pod of derelict midcentury Futuro and Venturo houses lines a semi-abandoned beachfront resort outside Taipei.

This ancient Hawaiian henge may have been an early star chart.

The southernmost point in the United States is a beautiful place to look at but a deadly place to wade in.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

A prehistoric landscape hidden in the cliffs of Maha'ulepu.

What remains of the summer palace of King Kamehameha III.

This tiny Hawaiian island is slowly coming back to life after being bombed during naval training exercises.