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

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

This 47-story "M" needed 20 years to be completed

Possibly the oldest masonry dam in all of Europe.

In this coastal town, the time-honored tradition of reenacting the struggle between the Christians and Moors includes the arrival of the Moorish fleet.

A well-restored ancient archaeology site gives a real feel for life during the Roman age.

Originally planted by the ancient Carthaginians, this sprawling palm grove is one of the largest in the world.

A celebration of solstice followed by a fiery purging of evils.

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

A simple plaque on the facade is the only reminder that the treaty ending the American Revolution was signed inside.

Monasteries on rock pillars, once accessible only by frayed ropes.