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

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

A rare set of strings by famed instrument maker Antonio Stradivarius is on display in the Royal Palace.

Five million people are laid to rest here, more than the population of Madrid itself.

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.

Lava stone structures possibly dating back to the 19th century may have been a stopping point for voyagers between ancient Egypt and the Mayan Civilization.

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

Once the grandest synagogue in medieval Spain, it now stands as a memorial of the 15th-century Jewish exile.

A reproduction of the famous prehistoric cave paintings is hidden underground at the National Archaeological Museum.

Geological storytelling.

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

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

A historic Christian shrine nestled within a spectacular natural cave.

An iconic and controversial ancient Iberian funerary urn with a hauntingly penetrating gaze.

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

This fascinating and poignant museum chronicles every imaginable aspect of Spanish colonialism in the Americas.

On La Gomera, "Silbadors" communicate in a 4,000-word language of whistles.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

This line of 12 tower mills described in the story of Don Quixote is among the most iconic landscapes in Spain.

An ancient Roman theatre restored to its former glory in the Spanish city of Cartegena.

The oldest Roman lighthouse still in use.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.