This impressive rupestrian engraving dates back to the Upper Palaeolithic period.

A submerged village appears when dam levels drop.

Local lore says the devil built this beautiful medieval bridge to help a fleeing bandit.

An abandoned mining complex in Serra do Gerês.

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

This house covered in small stones was the work of one man over the course of nearly 30 years.

The atmospheric ruins of a historic church can be found on a hill above the city of Oviedo.

This panoramic lift provides a futuristic ride up San Pedro Mountain.

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

An accidental trick of light casts the perfect shadow of a pilgrim of the Camino de Santiago against the cathedral wall.

This abandoned naval battery stood at the ready as recently as the 1980s.

"Satisfying" is a good way to describe these beautifully aligned rows of Spanish mills.

This Gallo-Roman sanctuary is dedicated to Serápis, god of the underworld.

Behold, a collection dedicated to Germany's favorite vegetable.

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

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

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

These primitive rock paintings include a very beloved depiction of a woolly mammoth.

This century-old ruined temple was reborn as "The Church of Skate."

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

The beautiful bas-relief lines a sliver of a 19th-century walking path between two charming French villages.

This impressive chasm is one of the longest natural underground cavities in the world.