A public work of art that also provides some relief from the summer heat.

This one-time health resort was used by aristocrats around the world.

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

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

Unconventional site where the tracks of Zurich tramcars intersect.

Browse through a century of this principality's first popular export.

Liechtenstein's royal family calls this medieval alpine castle home.

An ancient Roman relief beautifully preserved on the façade of a house.

An underground city of salt.

This grubby wall is said to be one of the Earth's esoteric energy centers.

Inside this Krakow church, an explosion of psychedelic color.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

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

Climb inside an iron crystal magnified 165 billion times its normal size.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

This working class sculpture pounds his hammer all the livelong day.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

A bit of retro transportation flair preserved in the world's largest department store.