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

Hundreds of caves once used to store grains and animal feed.

Abandoned 18th century weapons factory in the Aezkoa Valley.

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

These striking ruins of a castle resemble a ship's stern.

The remains of an encyclopedic sculpture garden later used as an internment camp.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

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

The streets of a sleepy Spanish town proudly exhibit some of the world's finest graffiti.

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

A modernist church in an ancient village.

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

This overlooked museum houses an amazing collection of rare, antique typewriters.

Giant topiary dog once played a role in a terrorist bomb plot.

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

Seaside ruins of a settlement that date back to the first century B.C.

The Gaudí-inspired building that was the start of Terrassenc modernism.

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

This "flat geyser" bubbles up out of the ground periodically like a disappearing river.

Now a pile of ruins and rubble, this was a lovely mountain town as recently as 1960.

A living art gallery painted on a canvas of Monterey pine trees.

Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.

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

This ancient Spanish castle sits high upon a hilltop.