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

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

Both church and state get put to the torch in this annual festival in the "Bonfire Capital of the World."

A winding cave grotto walkway built to provide employment for veterans after World War I.

The London statue that imitates passersby.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

The Tudor-style cottage in the middle of the square is not quite what it seems.

Hidden beneath the streets of London is a secret subway that only carried mail.

Tombstones and enigmatic inscriptions hide within a vault beneath a popular London arts venue.

Formerly known as Saville Theatre, this mid-20th-century entertainment hub includes an ornate frieze.

Two plaques commemorate the site of Shakespeare's first theatre.

If your school was decorated with trippy graffiti, served ambrosial coffee, and was frequented by mimes, it might have been similar to this groovy cafe.

Black cat statues guard this temple-like Egyptian revival factory.

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

A friendly pub with a sordid past in cock fighting.

This landmark church concealed a crypt packed with bones that was discovered thanks to the London Blitz.

The remains of the great moral philosopher reside in a university in London.

A pair of club-wielding guardians stand watch over London's first public clock to feature a minute hand.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

A network of concealed passageways lies within a busy London Underground station.

This museum tucked below a charming cafe gives a brief snapshot of photographic history.

The Art Deco artwork depicts gilded carriers of deadly illnesses.

This religious museum resides in a church crypt next to the founder's house.

The curios of pharmacist and collector Henry Wellcome.