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

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

Eclectic final resting place of the controversial explorer.

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

The monster at the center of the Darwin Center Spirit Collection.

This secluded walkway overlooks a magnificently wild London green space.

A naturally mummified 2,000-year-old man.

A Roman spa buried deep beneath the City of London.

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

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 world's largest collections of pathological specimens.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

The anatomical-pathological collection of a man who changed surgery.

Catacombs turned marketplace.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

An ethereal glowing blue ocean cave in Croatia.

A wonderfully strange collection of 500+ stuffed frogs doing people things.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.

Now harmless, this looming post struck fear into the heart of medieval troublemakers.

A musical instrument played by the sea.

The remains of a sunken military ship wreck visible through clear water.

Now abandoned, the world's first torpedo factory is crumbling into the sea.

A quintet of history museums make this Virginia graveyard as much a resting place for funereal history as it is for people.