This Underground station has been a popular filming location for decades, even before it closed.

This sculpture, residing in a quiet corner of a London park, honors the victims of 9/11.

England's most famous front door has an accidental doppelganger.

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

The sculpture of the deceased cockatoo flops atop its personal plinth.

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

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

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

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

Public access to clean drinking water was an instant hit among the masses.

Pop culture has helped to keep this iconic British building from being destroyed.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

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

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

Scattered throughout London are ancient remnants of the city's former bounding wall.

The largest of London's subterranean rivers and once a mad, bad center of London life.

London's smallest police station is barely the size of a phone booth.

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

Hear the quietest sound from across the dome.

A makeshift shrine to the late rock star is still kept up on the nondescript façade outside 1 Logan Place.

Hidden beneath the streets of London is a secret subway that only carried mail.

This unassuming passageway played a key role in one of the most important events in U.S. history.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.