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

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

A beautifully eclectic mix of architectural styles.

This cheese shop also houses a museum devoted to Dutch dairy.

Go inside to really appreciate this 500-year-old technological masterpiece.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

Meet the bronze beloved pet to a family of famous peeing statues.

Lavish royal estate punctuated with heated greenhouses.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

A gift from Emperor Franz Joseph I to his wife.

This splendid tomb may look fantastic, but there's nothing in it...

Macabre astrological automaton clock dating to the late 1400s.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

Medicinal spa created with the discharge from a geothermal energy plant.

A 19th-century perch for spotting sailing ships now boasts one of the most iconic views in the Southern Hemisphere.

An ancient engraving by the Cammeraygal people was uncovered in the transformation of a North Sydney industrial site.

A collaboration of art and ornithology mourns the calls of Sydney's lost birds.

This charming stone church on the shore of Lake Tekapo is an icon in astrophotography.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

The very center of Paris is surrounded by a bevy of strange good luck rituals.