Topless shrine of northern Ghana.

The world's largest wooden structure.

The Roman city was the birthplace of various emperors and is home to one of the empire's most impressive architectural feats.

An underground spring in a labyrinthine cave system, decorated with stalagmites and stalactites.

An eerie collection of the surviving structures from a past celebration of the future.

Its appearance in "Game of Thrones" may spur on the long-awaited restoration of this medieval shipyard.

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

Drink the 'Blood of Christ' in this Roman Catholic fever dream.

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

A 16th-century Andalusian palace.

The ruins of a 2,000-year-old Roman fishing village perched on one of the best beaches in Spain.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

Touching this little fossil embedded in the wall of a grand mosque-cathedral may make your wishes come true.

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

This abandoned, turn-of-the-century astronomy hub is now the subject of more photographs than it ever took.

The defensive tower was built centuries ago to warn locals of Berber pirate attacks.

Visit 17th-century ruins on a strikingly beautiful riverside walking trail.

A micro-communist utopia in Spain with no police, no mortgages and full employment.

A reservation-only highland forest reserve of endangered Pinsapar firs stands above a village in Andalucía.

Moorish signal station on a stratgic rocky outcrop.

This remote location of this Moorish stronghold means it doesn’t attract many tourists—and that it still has the aura of fear and bravery of the 1300s.

A Spanish town built into the cliffs.

This quaint Spanish village agreed to be painted blue as a marketing stunt but found that they preferred it that way.

The hidden ruins of an old hydroelectric plant reclaimed by nature.