The commemorative stone column conceals a secret laboratory.

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

The last remaining example of the boatmen's perches that once dotted the south bank of the Thames.

The fences outside some of South London's estates are made from recycled World War II stretchers.

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

The broken skateboards that became a poignant memorial to a murdered skater.

Museum dedicated to the UK's first charity for abandoned children, with keepsakes of the mothers who left them behind.

One of the few remaining examples of 19th-century London’s attempt to clean up its reputation.

A domino effect created with Britain’s iconic telephone boxes.

One of the greatest movie directors of all time lived and worked in this London flat from 1926 to 1939.

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

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

This Viking gravestone carved in a rare runic style was dug up from a London churchyard.

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

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

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

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

The remains of an ancient Roman teenager are memorialized at the base of a modern London landmark.

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

Ship-sized kinetic sculptural fantasy.

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

These morbid carvings remind churchgoers of the inevitability of death.

There's an exclusive Beefeaters pub hidden in the Tower of London.

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