A colorful architectural gem in Seattle's uniquely modern Central Library.

At just six feet two inches deep, it is said by Guiness and Ripley to be the world’s narrowest freestanding office building.

A pixel art killer whale is frozen mid-leap in this Vancouver square.

A working steam clock, one of only a few in the world, located in Vancouver's Victorian Gastown.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

An early 20th-century bullring converted into a modern shopping center.

A beautiful but toxic fountain of mercury.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Barça football fans might see the insignia hidden in a church window as a divine sign.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

Home to items never before seen by the public.

Perhaps the most scandalous statue of America's first president.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

There’s a hidden military meme engraved on the World War II Memorial.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."