150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

This five-star hotel was originally a swanky parking garage.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This eye-catching roundabout sculpture commemorates one of England's best World War II-era "shadow factories."

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This 1920s Dutch barge is now a floating bookstore.

A measuring mishap led to these artificial stone ladies losing their stomachs.

This luxury shopping lane has been protected by its own tiny police force for over a century.

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.

This London plaque marks the spot where David Bowie's famous alien made his debut.

The U.K.'s first underground railway line is now a lively thoroughfare for runners and cyclists.

This intricately carved and hilariously huge bed was such a famous symbol both Shakespeare and Byron used it in their writing.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

An unusual ode to the late Irish playwright, complete with a squiggly bust and coffin-shaped bench.

Tombstones and enigmatic inscriptions hide within a vault beneath a popular London arts venue.

England's most famous front door has an accidental doppelganger.

A series of carved figures that scandalized British society.

A living memorial to the trees London lost during the Great Storm of 1987.

It is still illegal to "quarrel" at this unlikely urban oasis built on top of an electrical substation.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

A unique tribute to the millions of animals who served and died for the British military.

A plaque marks the underground site of one of London's "lost rivers."