Mary Kelly was last seen here before she was murdered by Jack the Ripper.

An unusual round church in London with a Templar past.

This South London cemetery holds the remains of more than 15,000 people.

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

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

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

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

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

100 year tradition of fist fights, marked by marble footsteps.

Famously misunderstood wonder of the ancient world

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

This unassuming alcove in London’s famous Tower Bridge once served to capture, store, and display dead bodies from the River Thames.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

400-year-old garden, restored to beauty.

A historic lighthouse steeped in rumors of ghost and pirate stories.

The abandoned grounds and derelict greenhouses of this once-magnificent Edwardian estate are now a nature preserve open for exploration.

A tribute to the hard-working men and women of Grumman, who crafted F-14 fighter jets.

An abandoned Gold Coast-era mansion once intended for the exiled ruler of Albania, who never arrived.

An eccentric playboy's astounding natural history collection.