The vast, legendary catacombs hold secrets much stranger than stacked bones.

A surrealist timepiece by the artist of melting clocks.

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

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

A historic house left in "dramatic still life."

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

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

Rebuilt remains of a temple to Roman god Mithras.

A student driver's nightmare.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

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

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

A castle built for love, and abandoned due to heartbreak.

Giant, friendly pelicans in Central London, the most unlikely of places.

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.

A closed London rail station created to cart away the dead still bears the marks of attempts to make it less morbid.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

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

English antique dealers with a taste for the unusual.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

The television series' iconic giant foot was borrowed from this classical painting.

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

One of the world's largest collections of pathological specimens.

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