1513 Turkish world map, full of European state secrets and snarky commentary.

This famous city eluded concrete detection until the early 2000's.

There is a mouldering Jewish cemetery hidden away in the capital of Moldova.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

The Emperor Tiberius' palace of debauchery.

Fascinating town where normal life interfaces with the occult.

Scattered throughout London are ancient remnants of the city's former bounding wall.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

A small memorial to a deadly night in Serbia that shook the world before it was swept under the rug.

Da Vinci's equestrian statue, 500 years in the making.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

2300-year-old Roman road connecting the empire.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

Every equinox this Maya pyramid puts on a spooky ancient light show.

What was once a unique system of urban elevators is turning into a mechanical ruin.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

A church of bones, decorated with 40,000 human skeletons.

Macabre astrological automaton clock dating to the late 1400s.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.