The striking jade death mask of an ancient Maya king is displayed in a replica tomb in Mexico City.

The original resting place of Queen Cleopatra and Mark Antony's only daughter.

This crumbling medieval basilica once attracted pilgrims by the thousands to collect a miraculous dust that formed above the saint's tomb.

Flames have been burning within this mountain for more than 2,500 years.

A mysterious ancient cemetery with Roman sarcophagi and Lycian inscriptions.

This church houses the tomb—but not the remains—of St. Nicholas, the likely progenitor to Santa Claus.

The ruins of this antebellum sugar plantation are the end result of a Seminole attack during the Florida Wars of 1836.

Pompeii's less famous neighbor is still revealing her secrets.

A beautiful but toxic fountain of mercury.

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

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

Gods clash with machines in a power plant regenerated as a museum.

This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

This historic recreationist school churns out warriors that may very well have had a fighting chance in Rome's pits of the day.

Ancient ruins hidden underneath a modern luxury hotel.

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

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

A modern sliver of architecture in Roma.

The mystic whose incorrupt corpse still attracts the faithful.

The studio built by fascists in the hopes of "reviving the film industry" with the occasional propaganda film opportunity thrown in.

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

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

An Italian ghost town that fought obscurity, until a mysterious illness brought it to its knees.

A magnificent waterfall is also home to the remains of a Roman hydraulic engineering system.