A wonderful collection of fossilized dinosaurs and other creatures that roamed the landscape millions of years ago.

The cathedral of a controversial, conservative, schismatic sect that declared the Catholic Church heretical and founded its own succession of popes.

Peek into a cave of giant, glimmering crystals.

This ancient tunnel is one of the most important examples of Roman hydraulic engineering in Spain.

This panoramic lift provides a futuristic ride up San Pedro Mountain.

Despite its grandiose name, this enigmatic first-century void under the town is no cave, and it's possibly not a palace either.

In Spain, the ruins of a Roman military camp sit along a flooded section of a river.

This Arab fortress was once the largest citadel in Western Europe.

The ruins of a 2,000-year-old Roman fishing village perched on one of the best beaches in Spain.

The largest medieval water tank on the Iberian Peninsula is preserved beneath the Cáceres Museum.

A beautiful little museum hidden away in the heart of Barcelona holds a treasure trove of Ancient Egyptian artifacts

This influential Renaissance-era library was once the haunt of kings and monks.

The atmospheric ruins of a historic church can be found on a hill above the city of Oviedo.

This local emblem is the oldest and largest dragon tree in the Canary Islands.

A magnificent place to see authentic paleolithic cave paintings that are an astounding 33,000 years old.

Now a pile of ruins and rubble, this was a lovely mountain town as recently as 1960.

The unexpectedly beloved remnants of a controversial thermal power plant.

This imposing modern citadel started out as a home renovation project.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

A contemporary art installation housed within a Gothic cathedral.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

12th-century holy complex shares land with a natural park full of heavenly waterfalls and raptors.

Seaside ruins of a settlement that date back to the first century B.C.

A historic Christian shrine nestled within a spectacular natural cave.