The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

Fantastic views and thousands of love locks.

Carved fountains poignantly placed in parks and in front of special monuments.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

This ancient Egyptian obelisk still bears the wounds of World War I.

The pockmarks across the building's facade are remnants of the Blitz.

This striking statue brings a scene from the African savannah into central London.

The medieval woodcut-style artwork chronicles life in medieval London.

A living memorial to the trees London lost during the Great Storm of 1987.

An architectural oddity hides in plain sight on this iconic London bridge.

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

Revel in the Victorian splendor of the world's oldest eating establishment inside a museum.

This former medical factory gives home to cutting edge arts in the shadow of a gas works.

Originally built for London’s cab drivers, this bright green hut now serves anyone a hot drink or meal.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

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

This luxury shopping lane has been protected by its own tiny police force for over a century.

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

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

After nearly 60 years, there's still a bear at Paddington Station looking for help.

Giant, friendly pelicans in Central London, the most unlikely of places.

The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.

London's old-school healing garden.

The television series' iconic giant foot was borrowed from this classical painting.