This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

This colossal couch is an unlikely monument to Europe's first female Doctor of Law.

Unconventional site where the tracks of Zurich tramcars intersect.

One of a series of no-purpose kinetic artworks by Swiss sculptor Jean Tinguely.

Vines grow up the metal bars in this public park created from an old machine factory.

One hundred years ago this small house in downtown Zürich became the birthplace of the Dada movement.

A huge cathedral single-handedly constructed by one eccentric monk.

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

Just like in Hollywood, Madrid has also a forgotten walk of fame.

Five million people are laid to rest here, more than the population of Madrid itself.

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

This small museum tucked within a subway station holds pieces from Madrid's past.

Shrapnel, dynamite, bullets and Franco couldn't destroy this bust, rescued and kept hidden as a family secret for over 40 years.

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

This small and often-overlooked museum holds some of Spain's finest artistic treasures.

An iconic and controversial ancient Iberian funerary urn with a hauntingly penetrating gaze.

This lucky bronze frog was gifted to Madrid by a casino.

A towering monument in Spain has proven to be more labor-intensive than initially planned.

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

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

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

This embalmed man is one of the best preserved mummies from the Canary Islands.