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 steamer is known as "The ship that built Cleveland."

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

Metal dinosaurs lurk in a sculpture garden on the outskirts of a popular resort town.

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

A toxic ghost town sitting atop a massive coal fire.

What is it about mushrooms that makes people wish they lived inside of them?

The overgrown remains of an old rail bridge rise above the valley like ancient Greek ruins.

This magnificent Cincinnati graveyard is also a popular public park.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

A crumbling hospital from the 1850s on Roosevelt Island.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

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

This abandoned bridge to nowhere stands secluded in the woods of a Cleveland suburb.

Quite possibly the last cross all humans will ever see.

Toxic waste disaster that founded the Superfund program.

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.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

A monument to the man who almost killed Hitler.

The most visited, and possibly most controversial, museum in Germany.