Another of California's unused Cold War missile defense complexes has become a graffiti gallery.

A lone historical marker off the highway and scattered debris are all that remain of this Cold War-era missile site.

An out-of-place Air Force radar dome is all that denotes this park as a former missile launch site.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Inside this church are the alleged remains of the patron saint of lovers, epileptics, and beekeepers.

This species of wild goat stars in witchy legends and frolics among the park's eerie rock formations.

This small and often-overlooked museum holds some of Spain's finest artistic treasures.

The little church's beautifully frescoed ceiling has earned it the nickname “the Sistine Chapel of Madrid.”

Commonly acknowledged as the only public monument to the Devil himself.