This massive blockhead sculpture hides an entire library.

Auguste Maïcon, a pioneer in French aviation, was born in this house in 1891.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

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

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Unrepaired walls from a 1920 anarchist bomb attack.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

Buildings from the fictional planet of Tatooine still litter the Tunisian desert.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

Venice's island of the dead.

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

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

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

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Week-long block party becomes a competition for the best decorated street.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

A daily pyrotechnic celebration marks a beloved tradition during Valencia's festival season.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.