A secret hatch containing two parchments was discovered in this statue over 40 years after its installation.

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

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

In Rome’s Jewish ghetto, a 200-year-old bakery still makes the neighborhood’s historic sweets.

2300-year-old Roman road connecting the empire.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

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

This former medical factory gives home to cutting edge arts in the shadow of a gas works.

London's first edible insect farm offers facility tours and cooking classes.

The collection contains over 25,000 items and details the painful dental practices of the past.

Taxidermied animals galore, by appointment only.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

A Victorian natural history and ethnographic museum with wonderful turn-of-the-century, science-book-esque evolution displays.

The curios of pharmacist and collector Henry Wellcome.

An unremarkable wooden wheel built into the side of one of Rome's oldest hospitals was part of a policy to reduce infant exposure.

Rome is now home to a stunning food museum and library.

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

One of the most important yet well-hidden museums dedicated to the history of medicine.

A forgotten "city of water" underneath the famous Trevi district.

The Pope’s secret escape route.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

What happens when you cross a mayor and a painter?

France's most famous cemetery, with some of its most curious tombs.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.