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

Lava stone structures possibly dating back to the 19th century may have been a stopping point for voyagers between ancient Egypt and the Mayan Civilization.

This amended headstone marks the grave of a participant in one of the most successful military deceptions of all time.

Part of the medieval watchtower is displayed in an otherwise ordinary parking garage.

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

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

This 47-story "M" needed 20 years to be completed

A series of recreated fortifications mark George Orwell's path through the Spanish Civil War.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

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

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

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

A 16th-century Andalusian palace.

An abandoned Indian-inspired mansion.

The oldest Roman lighthouse still in use.

Moorish signal station on a stratgic rocky outcrop.

The world's largest wooden structure.

The final resting place of the great navigator, or maybe his brother.

Cliffside houses provide a spectacular view from their perch above the valley.