This historical Netherlands fortress still bears the marks of its single siege.

A once-magnificent collegiate church is falling into ruin.

This small chapel built into rock is the oldest place of worship in Luxembourg.

An ancient Roman relief beautifully preserved on the façade of a house.

The official motto of Luxembourg reminds passersby of the Luxembourgish commitment to their national identity and sovereignty.

This magenta statue commemorates the legendary marriage between a mermaid and the city's founder.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

Two standing giants remain as a tribute to Luxembourg's metallurgical past.

Some believe that the artist behind this whimsical statue inserted his own likeness as a way to discreetly flip the bird.

Statues of a fire-breather, a clown, and a whole performing troupe celebrate Luxembourg's creative side.

A 12th-century castle featuring a sensory path where partially-sighted visitors can experience regional history through touch and sound.

Below the altar in Saint-Willibrord Basilica rests the mortal remains of Luxembourg's patron saint.

In the heart of Luxembourg's "little Switzerland" weaves a breathtaking natural sandstone canyon with a mythological past.

Romania's triumphal arch looks out over Bucharest.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

A celebration of all things tacky, garish, and bizarrely creative in the Romanian capital.

The preserved arm of a third-century sorcerer is believed to have the power to lift curses and spells.

The bust of Romania’s most notorious ruler, Vlad Dracula aka "Vlad the Impaler," keeps watch over the ruins of his medieval court.

This once-derelict building is now one of the most beautiful bookstores in the world.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.