This colorful statue welcomes visitors to a Barcelona park.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

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

This memorial, built by fascist dictator General Franco in 1960, has been repurposed by the people of Catalonia.

Stunning Roman aqueduct used for 1900 years and still standing.

Long tunnels run under the ancient chariot racing circuit to the tower.

This Roman arena once played host to bloody gladiatorial battles.

Touching the iron railings of Tarragona's balcony to the Mediterranean is said to bring good luck.

The bones of the Biblical Magi traveled to Constantinople and Milan before landing in their current home inside an elaborate golden reliquary in the Cologne Cathedral.

This mine is home to the largest man-made hole in Europe.

The last bastion of Roman presence north of the Alps looms over a German town.

The floorboard scrawling of a tragic madman is on public display outside a Paris hospital, much to the dismay of its opponents.

This saucy statue once caused outrage among locals.

Designed to mark the geographical center of France.

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

For more than a century, revolutionary graffiti has marked the wall of a Parisian church.

This small, ingenious cannon once helped regulate Parisian life.

A fortified palace in the shape of a ship on the Thiou river.

The ruins stand as a somber reminder of France’s worst civil catastrophe of the 20th century.

This 18th-century sundial was designed to calculate the date of Easter each year.

A poem by Arthur Rimbaud is inscribed on the wall of a street that, while it is only one block long, plays a key role in multiple novels.

For over 300 years this little carving has been the city’s good luck charm.

An ancient ossuary in Rouen.