Hidden well off the beaten path in Catalonia is this crumbling medieval castle that is slowly being covered in graffiti.

A modernist church in an ancient village.

The ruins of a bombed medieval village memorialize the destruction of the Spanish Civil War.

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

Stunning Roman aqueduct used for 1900 years and still standing.

The abandoned ruins of a beautiful medieval castle just outside Barcelona.

This whimsical winery by Antoni Gaudí looks ripped from the pages of a fairytale.

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

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

A Spanish forest is filled with mysterious stone carvings.

A gravity-defying "devil's bridge" that has a surprising architectural feature for its stability.

An ornate tower shows off a local artist's architectural flair.

Tower that was a frequent stop on the travels of King James I.

This medieval fortification has weathered the centuries better than any other structure from its era.

This ancient Spanish castle sits high upon a hilltop.

A Romanesque tower appears when water levels drop.

Village situated on a narrow volcanic escarpment.

Wonderland replication in progress by one persistent man.

A darkly erotic open-air statuary in Catalonia.

At the foot of a waterfall lies a peaceful swimming lagoon and evidence of over 60,000 years of human habitation.

Haunting monument to the German Jewish philosopher who died while fleeing fascism.

This tiny Bulgarian town offers a stunning location in the mountains and a storied history.

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

The growing stones of Romania.