The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

This curious, round temple is the oldest still-standing marble building in Rome.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

A massive marble foot is tucked away in a small alley near the Pantheon.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

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

This ancient market is often referred to as the oldest shopping mall in the world.

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

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

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

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

The “City of Stairs” sits high in the Andes, above the world’s largest underground copper mine.

A beautiful deserted greenhouse in the middle of a park.

A museum founded to reflect on and remember the human rights abuses under Chilean dictator Augusto Pinochet.

This museum covers 10,000 years of Pre-Columbian Latin American history.

This sculpture meant to honor the bravery of the Indigenous Mapuche people of Chile proved controversial.

It's just another skyscraper, but it's shaped like '90s cell phone.