A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

Paris' linguistic guide to the international language of, yes, love.

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

An architectural oddity hides in plain sight on this iconic London bridge.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

Ancient serpentine sacrifice holder that has stood the test of time.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A fountain standing as a testament to a doomed alliance.

A marvel of Byzantine engineering under the streets of Istanbul.

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

A patriotic medieval knight in driven-nail armor raised money for widows and orphans of WWI.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

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

A collection of miniature, symbolic sculptures hides in plain sight across Kyiv.

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

This unassuming museum's slogan translates to “there is a limit of sadness, anxiety has no limits."

An Art Nouveau building covered in animal gargoyles and grotesques.

One of the largest busts in the world celebrates the German city's erstwhile namesake.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

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

The oldest inn in England served brew to the crusaders.

This giant glowing "beanpole" adds much-needed pops of color to an otherwise drab power plant.

One of England's most famous churches hides a pair of little known architectural treasures.