The mysterious large white cross visible from the runway is a memorial to a massacre during Spanish Civil War.

This semi-secret storybook hedge maze is also the oldest garden in the city.

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

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

A curious memento mori hangs in the magnificent Cathedral of Segovia.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'