The house of a former Argentinian president stands protected within a large glass case.

Crumbling crypts and overgrown graves rise just out of arm's reach in this forgotten Buenos Aires graveyard.

The narrowest house in Buenos Aires is less than 10 feet wide.

This magnificent abandoned hotel has long been haunted by its Nazi past.

A beautiful young girl said to have been buried alive in her coffin…

Massive rock sculptures formed during the time of the dinosaurs still stand undisturbed.

A Swiss man built this airstrip for aliens because a UFO captain telepathically told him to.

An Argentinian businessman facing terminal cancer built this whimsical medieval village using salvaged materials.

Museum housed in underground tunnels that date back to Buenos Aires's earliest settlements.

Some say this medieval church is where the poet Dante married his wife and also met the love of his life.

St. Francesca Romana, patron saint of drivers, resides in the church she founded.

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

Rome's first modern graffito is all that is left of a peaceful protest from the 1970s.

This basilica is dedicated to two saints, one of which is known more for his famous quote.

An 18th century fountain and two columns are all that remains of Rome's forgotten river harbor.

Plaques on its facade commemorate the Tiber's most destructive deluges.

An 18th-century post box used to alert the church of sick and ailing foreign pilgrims.

A statue representing a lost Roman profession that was vandalized for centuries.

Just across from the "Last Supper" painting is the famous painter's vineyard, a gift received for creating the masterpiece.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

A fortified medieval basilica on the Caelian Hill preserves extraordinary frescoes and one of Rome's most beautiful hidden cloisters.

This hidden alley near the location of Rome's first theater was the site of a curious miracle.

Romans decided this 16th-century "talking statue" was so ugly, they named it after a primate.

This ancient Roman arch misled treasure hunters for centuries.