Thousands of miniature bronze sculptures have taken over this city square creating a unique art installation.

The last fully functional fortress of Germany's World War II Atlantikwall.

The remains of the second-oldest zoo in Europe can be seen within these library gardens.

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

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

A lush indoor jungle fills this bustling Madrid transportation hub.

Commonly acknowledged as the only public monument to the Devil himself.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

An ancient Egyptian temple in the middle of Madrid, Spain.

What once sat in the world’s spotlight is today a largely disused ghost complex.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

The hallucinogenic center of the ancient world.

Monasteries on rock pillars, once accessible only by frayed ropes.

This striking sculpture of Icarus honors Greece's fallen flyers.

Tens of thousands of tiny bottles stuffed with various items.

An artist's mausoleum with a haunting echo.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

The mark of the Devil's horns on a marble column in Milan.

One of the world’s smallest bars, just 13 square feet, is brimming with speakeasy flair.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.