Once standing on solid ground, this slender beacon is a victim of the very shoreline it was charged with announcing.

Installed at a chaotic intersection, this gave London traffic cops a place to hang their heavy woolen coats.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

A small Montana town commemorates the dog who waited at the train station every day for his owner to return.

Bloodstains can still be seen in this medieval church where two medics saved lives on D-Day.

An unrecognized nation-state created in the 1820s to avoid taxes.

100 years later, they're still down there.

Small plaque marks the spot, but the true center is located about half a mile away on a private pig farm.

A plaque commemorates the spot in the Oregon woods where the first-ever Geocache was hidden.

This chain of artificial lakes was an ideal test ground for the aircraft that would carry the "bouncing bombs" used by the WWII "Dambusters" squad.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

The unbelievably opulent home built for an infamous newspaperman.

Underground vaults of a former brewery beneath Brooklyn's Crown Heights are now used to ripen cheese.

The world's longest and deepest train tunnel.

A Japanese train station built around a 700-year-old camphor tree.

A mistaken marker makes an erroneous claim along the historic Old Divide Road.

Hundreds of hopeful gold miners came here to get rich, but only two years later the small town was deserted.

Harry Potter once visited this massive limestone cliff, which was carved by an ancient glacial river.

An elegant chandelier hangs over this ancient sewer chamber, now open for concerts and public tours.

Hamburgers are intensely proud of their tunnel beneath the river.

This folly built to commemorate an aristocratic victory over Catholic rebellion plays tricks on the eye.

Its town washed away centuries ago, this lonely tower by the sea tells the tale of a mermaid and a curse.

The walls of the iconic dome are hollow and have a secret stairway.

A century-old network of freight tunnels underneath the city's historic business district.