The trials and tribulations of marking Poe's grave.

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

Stone memorial that's said to predict the death of the pope and the site of the Cadaver Synod.

If you want to talk to the Pope you will have to stare down this surreal vision of Jesus rising from a nuclear hell.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

One of seven Jewish catacombs in Rome and one of only two open to the public.

This ancient Roman prison is decorated with an upside-down cross not as blasphemy but as saintly tribute.

A Nesting Doll of Churches.

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

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

The yawning maw of this pagan visage is said to bite off the hands of liars.

The underground sanctuary of a mysterious ancient cult.

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

Visit the WWII bunker where the British won the battle for the skies.

This beautiful Victorian ironwork masterpiece was built to keep London from smelling like poop.

Shakespeare, David Bowie, Dr. Who, the Saxons, Druids and Romans are all claimed to have all made their mark on these massive man made tunnels.

The remains of Crystal Palace Great Exhibition of 1851.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

The first tunnel to be dug beneath a river, repurposed as an art and museum space.

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

A special shop catering to the needs of things that go bump in the night, and also helps kids become writers.

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