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

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

A memorial to a dog that inspired rioting in the streets of London.

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

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

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

The secret wartime bunker built on the platforms of an abandoned Tube station.

The majority of the museum's large collection is held in a storage space open to the public a few times a year.

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

The last four extravagant street signs of London's historic banking street.

This overlooked street light once served as a KGB dead letter box.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

Ship-sized kinetic sculptural fantasy.

Where condemned pirates met their grisly end at the gallows on the River Thames.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

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

A Roman spa buried deep beneath the City of London.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

Dictionary Johnson’s favorite feline.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

Remnants of cells from the most notorious London prison may lie in the basement of a rare Victorian Gin Palace.