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

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

An early 20th-century bullring converted into a modern shopping center.

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

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

Mountain where Jesus was first tempted by the Devil.

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.

These mechanical goats first battled it out in the year 1551, all because of an overcooked deer.

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.

This picturesque castle in Poland has a rich history, including a legend that ties it to lost Incan treasures.

This grubby wall is said to be one of the Earth's esoteric energy centers.

This 13th century Gothic brick castle is the largest in the world by surface area.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

A striking public sculpture representing the period of martial law in Communist Poland.

The silly symbol for an underground protest group is now scattered around the city.

Polish luminaries and masterful folk art find sanctuary in this unique cemetery.

These massive moving sand dunes have swallowed an entire village and are still on the run.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

This bell stars in a tragic love tale and is said to make wishes come true.

Catch a scenic view of Warsaw's Old Town from the top of a centuries-old dumping ground.

The last king of Poland was interred in this church nearly 200 years after his death.