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

The world's oldest Jewish library was founded by Sephardic Jews in 17th century Amsterdam.

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

A beautifully eclectic mix of architectural styles.

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

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

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

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This artificial archipelago was supposed to resemble a map of the world.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This amazing mountain temple is topped by one of the tallest sitting Buddha statues in the world.

This peaceful, round shrine in the middle of the Sri Lankan jungle acts as a beacon of peace.

This elaborate temple was built around one of the Buddha's teeth.

An ancient stone fortress considered by many to be the eighth wonder of the world.

This bronze sculpture on a former squash court marks the secret origins of the Atomic Age.