An unusual but excellent display created in the 1930s as propaganda against the Freemasons.

This centuries-old tower hosts endangered bald ibis mating pairs and looms over a pristine beach.

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

In Spain, the ruins of a Roman military camp sit along a flooded section of a river.

This chapel is the site of a yearly pilgrimage that originated during the Middle Ages.

These narrow stone granaries have been used to store and dry out grain for hundreds of years.

A cluster of granite granaries perched on stilts.

An abandoned mining complex in Serra do Gerês.

The world's most elegant power lines.

The discovery of these rare, ancient artifacts led to the creation of a new museum.

The effect of this ancient form of image projection situated atop an 11th century Moorish palace is thrilling.

A submerged village appears when dam levels drop.

The cathedral of a controversial, conservative, schismatic sect that declared the Catholic Church heretical and founded its own succession of popes.

This 7,000-year-old megalithic wonder covered by a Franco-era reservoir emerges in times of drought.

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

Blue-green pools and smooth stones comprise one of Spain’s most idyllic hidden wonders.

An icon of the city, this chapel features an amazing dome ceiling and offers panoramic views.

This ship offers visitors the chance to spend the night aboard a former floating hospital for fishermen.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

A small Portuguese cottage formed between boulders in the countryside.

A replica of the Roman emperor in glorious full color.

This small Spanish village is home to dozens of public paintings meant to trick the eye.

This former charity hospital for elderly clergy houses some of Seville’s most treasured paintings.

A 16th-century Andalusian palace.