This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

Giant granite sculptures representing family on the northern coast of Spain.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

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

This technological marvel is one of the world's first 3D-printed bridges.

Stormy conditions send jets of seawater bursting through holes in the cliffs.

A magnificent, long-abandoned castle built in the wake of the reconquest of Spain.

According to tradition, King Phillip II supervised construction of the seat of his empire from this seat carved into rock.

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

A road that winds through this natural cave is the only way to access the small, appropriately-named village of Cuevas.

The tiny Spanish village that long refused to change its outrageously anti-Semitic name.

A spectacular walk on the flank of a gorge.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

These ungulates have quite literally bounced back from the brink of extinction.

A historic Christian shrine nestled within a spectacular natural cave.

This rough experimental house was created by flooding a dirt hill with concrete.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

The facade of this 16th-century building is decorated with carvings of 300 seashells.

This gaping hole in the middle of a remote mountain lake looks like a portal to another dimension.

1,300 chamber pots and their eccentric collector.

A prehistoric cave in Spain contains paintings dating back to the Ice Age.

See replicas of Europe's most famous cave paintings and even some of the animals that feature in the art.