History is hiding at the Morean Center for Clay.

Recycled junk and fishing buoys litter the yard and facade of this bait shop cum art project.

Historic, 19th-century wagon wheel ruts cut into soft volcanic ash.

This trail leads to a mine that was used as a sanctuary during the Great Fire of 1910.

A breathtaking 19th-century trail overlooks Lake Tahoe.

A former chicken restaurant that doubled as a speakeasy is now a quirky home full of wonderfully strange traditions.

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

Roman-era ships unearthed...

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

The Pope’s secret escape route.

Rome's ancient Etruscan rival, now a park full of ruins.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

Architectural monsters are devouring this palace's every door and window.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

2300-year-old Roman road connecting the empire.

The yawning maw of this pagan visage is said to bite off the hands of liars.

The underground sanctuary of a mysterious ancient cult.

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

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

An alchemist's "magic door" stands in the middle of a Roman park.

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

One of the most accessible undersea plane wrecks in the world.

Ship-sized kinetic sculptural fantasy.