This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

This steel frame is a skeletal mirage of a lost 16th-century stone building.

Home to the world's oldest functioning orrery.

This towering church is home to a world-famous organ and a treasure trove of medieval art.

Two stunning 17th-century libraries and a cabinet of curiosities.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

The rusted creatures wait to be discovered in Prague's botanical garden.

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

Its town washed away centuries ago, this lonely tower by the sea tells the tale of a mermaid and a curse.

A public urinal so pretty, it was declared a national monument.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

This frozen-in-time summer home outside Moscow provides a look at Russian life in the 1950s.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

Dr. Strangelove-esque tours reveal the inside a bunker once reserved for Stalin himself.

The Frank Zappa fan club erected this monument to their prog-rock hero to mark a new era of post-Soviet Lithuania.

An artificial hill and apparent calendric structure built in the Early Middle Ages immortalizes a legendary Polish princess.

This oddly shaped building is a surprising Soviet-era crematorium.

This museum explores the tumultuous history of Lviv under Nazi and Soviet occupation.

Last remaining nuclear missile base in Ukraine.

Marvel at the excessive luxury of the ousted Ukrainian president's former estate.

A fortress built to pacify local uprising that had a stint as a Nazi concentration camp before becoming a five-star hotel.

Get past the gatekeeper's apartment and enter an elaborate hoax of a restaurant with a Masonic feel.

A subterranean Holocaust refuge within one of the world's longest cave systems.

The largest catacomb system in the world.