The spirit of an executioner is said to cause cars to roll uphill in this English forest.

The biggest and deepest Cold War bunker open to the public can be found in southeast England.

This reconstructed Norman castle is the world's most accurate, from location to livestock.

Fantastically decorated underground chambers built in the 1760s.

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

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

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

The final resting place to 300 Victorian-era pets hides inside the city park.

Drink your espresso at a Victorian-era urinal in this underground-restroom-turned-coffee-bar.

The largest and best preserved necropolis in the Western Mediterranean.

The commemorative stone column conceals a secret laboratory.

This one has sailed five times as far as Sir Francis Drake's famous ship.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

This unique bridge curls up like a caterpillar to let boats pass and then unfurls again to span a small canal.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

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

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

This hidden green space is the city's second largest conservatory.

An incarceration museum on the spot of possibly the oldest prison in England.

A little slice of Japan and its aesthetics in London's Holland Park.

Catacombs turned marketplace.

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

Eighty million natural history specimens call this gargantuan museum home.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.