A surrealist timepiece by the artist of melting clocks.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

This demon atop the Notre-Dame de Paris looks utterly bored.

The celebrated eyesore created by starry-eyed sweethearts.

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

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

Paris' linguistic guide to the international language of, yes, love.

This bridge was constructed from the rubble of the infamous Bastille.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

France's most famous cemetery, with some of its most curious tombs.

The final resting place of the great navigator, or maybe his brother.

At this faithfully preserved medina off the Moroccan tourist circuit you can walk through six centuries of history in one day.

Famed architect Antoni Gaudi built this generous thank you gift to a friendly host who housed him during a job.

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

This whimsical winery by Antoni Gaudí looks ripped from the pages of a fairytale.

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

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

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

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

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

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."