A historic Christian shrine nestled within a spectacular natural cave.

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

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

Hidden behind a wall, Spanish nuns distribute their signature sweets on a revolving tray.

Bacteria and algae give the salty water its bubblegum hue.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

An ancient Egyptian temple in the middle of Madrid, Spain.

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

Three bridges and one giant canyon make up this fantastic Spanish settlement.

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