Catacombs turned marketplace.

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

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

A historic arboretum and non-conformist, non-denominational park cemetery.

Repository for more than 22 million pickled specimens.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

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

The largest of London's subterranean rivers and once a mad, bad center of London life.

A submerged archeological park still holds the wonders of a Roman Sodom.

Thousands of well-dressed mummies below a monastery.

A 16th-century horror show built in a lovely Italian garden.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

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

This delightful little museum is dedicated to only one thing: pasta.

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

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

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

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

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

Rome's ancient Etruscan rival, now a park full of ruins.