A crumbling island fortress that seems to be covered in a field of stone crosses but is simply incomplete.

This narrow path was cut right into a French mountainside to feed the country's early naval expansion.

A centuries-old complex of hand-dug stone chambers has sheltered locals in times of trouble.

This tiny river island switches sovereignty every six months as part of a rare, centuries-old agreement.

The eclectic observatory castle of a 19th-century astronomer and explorer.

This Navarrese cave's history of witchcraft and pagan ritual is not just embraced, but recreated each year.

Get a close-up look at a 16th-century Basque whaling ship at this factory and museum.

The remains of the wrecked steam trawler can be found on the beach at low tide.

An unusual monument to a 19th-century circus star.

The ruins of an unfinished explosives factory can be found while taking a gentle stroll through a Manx glen.

This magnificent arch is all that remains of a former smelt mill.

An ambiguous ambience emanates from this centuries old leprosy quarantine.

Poseidon? No one seems to know.

A legendary rocking stone, returned to its clifftop perch.

The world's oldest model village.

Celebrating the accomplishments of Black firefighters in Los Angeles.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

Historic funicular railway, believed to be the shortest railroad in the world.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

This 500-year-old Tudor home is a treasure trove of history and mystery.

Rent a barrel for a personal view of where the Baltic Sea meets the Gulf of Riga.

Trek into the depths of the cave where 17,000-year-old paintings exist alongside 400-year-old graffiti.

This hidden courtyard in the Andorran capital hosts a unique contemporary sculpture park.

This now-abandoned part of the original transcontinental railroad route provides a surreal driving and historical experience.