This "grandfather" eucalyptus is one of the tallest trees in Europe.

This grand gate once marked the entrance to a military barracks.

This 18th-century pond is one of the main attractions in the Jardín del Príncipe in Aranjuez.

Built to celebrate the glory of a new queen, this forgotten monument has moved around Madrid three times, reflecting 200 years of political whims and city redevelopment.

This modernist bridge highlights the bear as a symbol of Madrid.

A beautiful little castle with a rich history now home to the Archives of the Spanish Air Force.

An ode to the famous Las Vegas signage.

An old quarry transformed into a recreational and cultural space.

This historic fountain is a favorite neighborhood meeting point.

The largest and best preserved necropolis in the Western Mediterranean.

This centuries-old tower hosts endangered bald ibis mating pairs and looms over a pristine beach.

Designed by Gustave Eiffel before his famed tower.

This little sun pays homage to a massive gate that once stood at this location.

The remains of a convent turned military barrack in the heart of Madrid.

An Antoni Gaudí masterpiece in Astorga.

Housed in a stunning Victorian building, this museum has the largest exhibition of knives, blades, penknives, and scissors in Spain.

A historic castle that served as a backdrop to part of an elaborate extraterrestrial hoax.

The spectacular geological formations make it one of the most impressive caves in Europe.

Once used to calculate the various levels around the country.

The former home of a conniving 17th century politician is now a high-end hotel.

An abandoned 6th-century monastery features a medieval map of the known world.

The ruins of the second-largest circus school in the world.

The oldest building in Madrid.

Designed in the Romanesque style, this structure was once a fortress monastery.