Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

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

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.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Once the grandest synagogue in medieval Spain, it now stands as a memorial of the 15th-century Jewish exile.

The celebrated eyesore created by starry-eyed sweethearts.

A melancholy jester sits on the grave of a famous 20th-century ballet dancer and choreographer.

In 1927, a biplane disappeared while attempting to complete the first non-stop transatlantic flight between Paris and New York City. This memorial stands at the last place it was seen.

Executions were once held near this beautiful 18th-century fountain.

This mountaintop mariner’s church is packed with model ships and nautical art while hosting an annual maritime festivity for the townsfolk below.

Home to fantastic views and ancient graves.

One of the oldest and largest wooden churches in France was very evidently constructed by shipbuilders.

The lost Latin words were reconstructed using the holes from the nails that once pinned them in place.

One of Jeff Koons’s largest sculptures and his first commemorative work.

The huge golden reliquary of a testicle-smashing saint.

This little train station is forever immortalized in film history.

Lyon's miniature version of the Eiffel Tower was built as a statement in support of French secularism.

A fortress on this island housed the mysterious prisoner known as the "Man in the Iron Mask" for more than a decade.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

Immortalized by artists, this church incorporates a medieval lighthouse into its shoreside structure.

Nearly every wall in this French villa has been "tattooed" by artist Jean Cocteau and other famous painters.

Balconies that have a most unusual accent.

This abandoned church in central Lyon is missing its front stairs.