World's largest film studio, where visitors tour the decaying sets that litter the harsh desert environment.

A fortified city, home to a remaining population of five families

Morocco's Argania trees are infested with nut-hungry goats.

One man's quest to fix his toilet unearthed over 5,000 artifacts spanning more than 2,000 years of history.

A long-buried ancient ruin unearthed right in the middle of the city.

Skulls and skeletons are omnipresent in this church dedicated to souls trapped in purgatory.

A dead saint, a deadly poison, and a mysterious holy ooze.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

A replica of the Roman emperor in glorious full color.

Perhaps the most spectacular grotto along the Algarve coastline.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

The world's oldest bookshop still in operation.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

A hidden three-foot-wide house separates these two regal churches.

This castle has links to Portugal’s founding and struggles for independence.

Stockholm's narrowest alley is barely over two feet wide.

The first statue to be added to Saint Peter's Square in over 350 years is an ode to migrants and refugees around the world.

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

Haunted by its violent past, this colonial bastion was the largest Spanish military installation in the Americas.

Visiting dignitaries and Hollywood stars once stayed at this 1920s hotel, alongside ghosts that are said to haunt its corridors.

The mountaintop inspiration for Umberto Eco's "The Name of the Rose."

A remote candy-striped mountain in the Peruvian Andes straight out of the pages of Dr. Seuss.

This demon atop the Notre-Dame de Paris looks utterly bored.