This memorial to the Mercury Seven astronaut stands at the site of his former elementary school.

A stunning, abandoned limestone quarry in southern Indiana provided the stone to erect the Empire State Building.

A half-buried vehicle in Prague's is the latest iteration in a long-running piece by Czech artist David Černý.

Local folklore claims that this wall was not built for defense, but to provide labor during a time of famine.

An existential riddle in the world's largest ancient castle.

A surreal statue honoring Prague's favorite literary son.

This spooky statue sits outside a famous Prague theater.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

A grumpy old water goblin guarding an old mill on the Devil’s Stream in Prague.

A series of playful yellow penguins share a serious message about the environment.

A mocking tribute to the past and modern leadership of Prague.

A Jenga-style cylindrical tower of books that appears to go on forever.

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

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

Op-art architecture designed for happiness.

This Austrian museum celebrates the work of famous forgers and their inimitable imitations.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

Also known as Uncle Karl, the beloved bronze copper keeps a watchful eye on St. Stephen’s Basilica while people rub his lucky belly.

A plaque bearing the names of those who dedicated themselves to protecting Budapest's Jewish population during World War II.

The metal leaves on this tree are engraved with the names of Holocaust victims.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

Alleyway plaque commemorating the death of a fictional character in The Maltese Falcon, not far from the author's home.