This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

Designed as a reminder of one of the darkest moments in Austrian history.

An abandoned textile mill that is now home to art and concerts.

Known as "Toronto's Flatiron."

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

For over a century, it has been a tradition to raise a flag at the top of this 450-foot sandstone pillar on the 4th of July.

A blend of art, antiquities, and Americana fill this museum, surrounded by whimsical, enchanting gardens.

The metal leaves on this tree are engraved with the names of Holocaust victims.

This sculpture honors the man who was known as the "Righteous Among the Nations."

Legends surround this natural rock formation that looks like a Moorish king wearing a crown.

Vibrant street art created with mixed media.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

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

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

A pair of gigantic baby heads greet passengers at Atocha Station.

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

A rare set of strings by famed instrument maker Antonio Stradivarius is on display in the Royal Palace.

This postmodern apartment block was designed to be a vertical neighborhood.

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

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

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

A lush indoor jungle fills this bustling Madrid transportation hub.

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