Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A place steeped in history that may be best known as the set of a 1960 film.

Walk into an underground archeological dig, the site of the Roman Forum that was once the center of Valencia.

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

With a facade that measures just 107 centimeters, this five-story building is one of the skinniest in Europe.

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

Vibrant street art created with mixed media.

The head of a legendary creature allegedly killed during colonial times is now on display at a local restaurant.

This cave was once thought to be a hiding place for the devil.

This evocatively named natural crevasse was created by a torrent of water that smashed right through a granite deposit.

This mysterious artificial cave has long puzzled New Englanders.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

Supposed Massachusetts Grave of a pre-Columbus Knight Templar.

One of the largest Masonic temples in the world, created at the height of the oil boom in ostentatious style.

Locals dubbed it the "Owl Building" because of its bird-like appearance.

A grove of colossal man-made flowers built to collect the sun's rays.

This lone tower casts an outstretched shadow over the site of a once-wealthy Knights Templar preceptory.

An outdoor display of military missiles developed at Point Mugu Naval Base.

The beloved dining spot stands at the cross-section of Hollywood and the Old West.

The ruins of this long-abandoned unsuccessful gold mine can still be found.

Abandoned anti-ballistic missile base.

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

Named after a bandit and the star of several Hollywood prehistoric landscapes, these sandstone formations are a historical part of the Los Angeles natural landscape.

A massive volcanic plug is now a protected area that hosts a number of bird species.