An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

The world's most active stratovolcano is almost always erupting.

Underneath a chalk hill in France lies what Hitler hoped would be the underground launching base for a devastating new weapon.

A whimsical bridge uses saxophones to pay tribute to two great men and the European Union.

A giant desert bird that once swung music fans at Coachella now has a home in a nearby traffic circle.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

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

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

This house's itty bitty size means no humans allowed.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

A spectacular Bulgarian cave resembling a devil's head with a waterfall rushing down its throat.

A gigantic statue of a Russian soldier watches over the ancient city of Plovdiv, a prominent reminder of the Soviet period in Bulgaria.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

UNESCO-protected ancient burial ground.

A mountain pass in Bulgaria's Balkan Mountains was the site of four historic battles.

A magnificent, glittering building tucked into a tiny Bulgarian mountain town.

An homage to the medieval rulers of Bulgaria.

This tiny Bulgarian town offers a stunning location in the mountains and a storied history.

An abandoned saucer-shaped monument in the Bulgarian mountains.

The short oil boom of Venice Beach, and its swift removal from the tourism-laden landscape.

The most famous location in China was home to whole dynasties worth of imperial rulers.

An entire town preserved as a historic landmark.

Apartment building was once posh playground to the Hollywood elite.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.