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

Vibrant street art created with mixed media.

A contemporary art installation housed within a Gothic cathedral.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

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

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

The world's largest wooden structure.

A temple to modernity, tucked away amid Barcelona's more well known museums.

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

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

An ancient Egyptian temple in the middle of Madrid, Spain.

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

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

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

This fairy-tale, neo-Gothic church in the Azores is a world of magical realism.

Unconventional site where the tracks of Zurich tramcars intersect.

A constellation of golden cobblestones shows the names of local children born under a full moon.

The bears of Bern have been a city highlight for over 500 years.

The world's longest and deepest train tunnel.

Florentine Renaissance style building in Switzerland, home to the world's largest taxidermy Great White Shark.

Abbey built on the ruins of Roman catacombs.

Vines grow up the metal bars in this public park created from an old machine factory.

One of a series of no-purpose kinetic artworks by Swiss sculptor Jean Tinguely.