For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

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

Originally used to sell brandy, the bull-shaped billboard became an iconic symbol of Spain.

The unexpectedly beloved remnants of a controversial thermal power plant.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

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

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

Trek into the depths of the cave where 17,000-year-old paintings exist alongside 400-year-old graffiti.

This futuristic observatory at the top of the Pyrénées offers unrivaled views.

Gutted during the Liverpool Blitz, this architectural husk has been left destroyed in honor of the dead.

The quiet field that inspired one of the most famous songs of all time.

The Liverpool street made famous by the Beatles is real.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

An homage to Jackie Gleason's bus-driving character from 'The Honeymooners.'

During World War II this was the site of an "honor camp" used as a prison for draft dodgers, Native American conscientious objectors, and Japanese-Americans—including a man who brought his case against the camp to the Supreme Court.

Red sandstone structures dominate this landscape, which has been inhabited for some 5,000 years.

A strenuous, unofficial trail leads to spectacular views in one of America's most remote national monuments.

This huge dam across the Colorado River caused an armed standoff between two U.S. states.

More than 25 fully functional scale replicas of famous lighthouses dot the shores of Lake Havasu.

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

A 150-year-old steam locomotive crosses the southern half of the island daily.

This bomb shelter-themed bar has barely changed since it opened.

This beloved roadside attraction welcomes visitors with his signature neon smile.

The remnants of an early automobile route across shifting sand dunes can still be found in the deserts of Southern California.