Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

The solemn exterior conceals an opulent interior of this 17th century church.

An exquisite Baroque church in Vienna's old town.

The Habsburgs' royal collections of art and wonders.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Legends surround an ancient tree trunk riddled with nails for good luck.

Baroque celebration of the end of the Great Plague of Vienna.

This grisly effigy displays an early Christian martyr who was skinned alive and beheaded.

Just across from the "Last Supper" painting is the famous painter's vineyard, a gift received for creating the masterpiece.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

Dedicated to a young woman who broke gender barriers at the University of Madrid.

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

Guitarist Paco de Lucía overlooks travelers as they pass through this train station dedicated to his legacy.

The little church's beautifully frescoed ceiling has earned it the nickname “the Sistine Chapel of Madrid.”

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

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

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

A lush indoor jungle fills this bustling Madrid transportation hub.

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

A symbol for the opposition to nuclear power around the world.

A public display of random paleontology.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

The remains of an ancient bathhouse sit inside this aptly-named pub.

Semaphore saints, a golden dragon's head, and a stone carved with religious warnings all call this cathedral home.