Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

Accessible only by boat, this centuries-old island fort never saw troops or combat.

Designed to allow funerals to proceed over the River Dulnain.

Unruly residents were housed in this one-person cell until the Black Maria arrived.

Water of undetermined depth has attracted rare fish and cult leaders alike.

Also known as the Limete Tower, la Tour de l'Échangeur can be seen from almost everywhere in Kinshasa.

The equator passes through this tiny island in the eastern Atlantic.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

A stranded woman lived alone on this remote island for 18 years, inspiring the great children's novel "Island of the Blue Dolphins."

An underground world of gorgeous, palatial metro stations designed as a nuclear shelter complex.

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

A house mixing elements of Chinese and Mexican architecture stands as a tribute to the Chinese-Mexican bishop who lived here.

The narrow mountain road that carves a path between Florence and Victor is tied to ghost towns and ghost stories.

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.

A forest of immensely tall and unusually straight oak trees planted nearly 200 years ago to build naval ships that never came to be.

This millennium-old site reflects a time when sugar was a treasured commodity.

This massive subterranean fissure is known as the "underground Grand Canyon."

The only residents of this abandoned housing development full of identical castles are stray cats and dogs.

This massive underground salt mine now holds a sci-fi theme park in its depths.

Why walk on this historical site when you can zoom down instead?

It's unclear what caused the fire that led to this opulent hotel's demise.

Beneath an ancient wishing tree lies an underground chapel with 12th-century frescoes and catacombs dedicated to a lady saint.

A unique rock formation that only a few have managed to venture inside.

Kayak out to a floating restroom.