It makes sense that this airport, serving one of Mexico's most artistic cities, also doubles as a gallery.

There was a top secret plan during World War II to seal a group of soldiers inside the rock.

Engineering ingenuity during the battle of Gibraltar.

Single runway interrupted by a busy road that cuts across its middle.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

A lush indoor jungle fills this bustling Madrid transportation hub.

A pair of gigantic baby heads greet passengers at Atocha Station.

This tower is one of the best-preserved (and least-visited) remnants of medieval Paris.

Order a boozy baba au rhum at the oldest patisserie in Paris.

Most-visited and most-photographed slot canyon in the American Southwest.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Hidden inside this Arizona fast food franchise is an in-depth exhibit on the famed WWII counterintelligence program.

The window above the urinal in the men's restroom is a giant periscope that offers a panoramic view of Eagle Harbor.

This monument remembers the first Japanese Americans forcibly relocated during World War II.

Overlooking Puget Sound sits a garden with a Buddhist prayer wheel and an elaborate labyrinth.

This remarkable collection devoted to the study of fish includes 1 million preserved specimens from all around the world.

Activists are fighting to preserve these unfinished highway ramps as a tribute to the citizen revolt that halted their construction decades ago.

The first park built over a freeway is a brutalist masterwork.

Granting the right of way to ships over surface traffic since 1917.

One of the oldest continually operating drinking establishments west of the Mississippi.

Mysterious ancient petroglyphs carved on a glacial boulder at the tip of Bainbridge Island.

This 18-foot-tall public art installation is another of sculptor Thomas Dambo's trolls.

The boulder is a landmark, public art, and an icon.

Seattle’s Whimsical Mural Master.