An eerie collection of the surviving structures from a past celebration of the future.

This unusual elevator doesn’t stop or slow down.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

This unattributed sculpture in Amsterdam is hiding in plain sight.

The attic of a four-century-old canal house hides a clandestine church.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

Cat art as far as the eye can see.

The graveyard is filled with beautiful funerary art and boasts breathtaking views of Florence.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

Where Venice's gondolas go for a tune-up.

Two stone columns flank the grand Venice square, but there were supposed to be three.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

This automated sculpture of two men peeing will spell out text messages with their micturition.

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

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

This spooky statue sits outside a famous Prague theater.

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.