This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

An ornate private entrance to the Vienna subway built specifically for the emperor.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Some of the greatest minds in the history of Hungarian art and science converged in this café.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

Ancient snack bar of the Roman Empire re-opened.

Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.

This modern sculpture looks out over the sea and amplifies sound from the inside.

One of the oldest universities in the world exhibits thousands of specimens from its 700-year-old collection.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

The facade of this 16th-century building is decorated with carvings of 300 seashells.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

The ruins of a 2,000-year-old Roman fishing village perched on one of the best beaches in Spain.

This unassuming stone bollard is a centuries-old marker denoting the center of the city.

Banished from town, this local jester concocted a clever return.

A monumental toilet that is also host to rare plants.

Though they might seem like arbitrary scratches in the wall, these were once official measures of length.

This whimsical statue dumps water on its head to symbolize knowledge flowing into his brain. Or maybe booze.

Above the door of a house, a plaque claims to commemorate the future living place of the inventor of time travel.

A giant bug impaled on a 75-foot-tall needle.

A largely overlooked statue that may commemorate the first publication of 'Don Quixote' outside of Spain.

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

This former guildhall with a bacon-like exterior is now home to a museum covering 600 years of Antwerp's musical history.

This legendary giant, born from vegetables, terrorized townspeople and cheated local children in games.