An ever-evolving wall of graffiti art off East Liberty Street.

Honoring the famed folktale author, this California museum looks like it belongs in the Black Forest.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Tiki luxury on Nob Hill.

San Francisco's newly reopened hands-on science museum.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

This giant shopping mall still holds signs of its automotive past.

The headquarters of a secretive order is also a beautifully-designed park.

An extensive collection of ancient Egyptian artifacts and mummies.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

The Boston square dedicated to the dark poet who was born nearby.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

This giant iron playfully pays tribute to an early 20th-century architectural trend.

"X" marks the spot of an echo chamber in the middle of a plaza.

A statue honoring 44 continuous years of greeting passing ships.

Probably the smallest museum in the world, housed in a disused phone booth.

A curious memento mori hangs in the magnificent Cathedral of Segovia.

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

Blue-green pools and smooth stones comprise one of Spain’s most idyllic hidden wonders.

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

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.