The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Rome's semi-secret peephole vista is also a former Crusader stronghold.

The underground sanctuary of a mysterious ancient cult.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

The first American department store, and home to the largest operating musical instrument in the world.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

Once a black market electronics marketplace, now an otaku shopper's paradise.

Tokyo’s only Vaudeville-cuckoo clock–steampunk-Victorian curio cabinet time piece.

The fairy tale castle of the "fairy-tale king."

The key to turning shifting dunes into the green oasis of Golden Gate Park.

This turn of the century masterpiece has a mysterious goaty interloper.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

This brightly made over hotel hides decades of suicide, serial killers, and mysterious deaths.

This weird abode has inspired everything from the "House On Haunted Hil" to a robot hunter's pad.

The legendary building that needed ghostly approval before being built.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

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

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.