At almost 1,000 years old, this is the oldest known door in all of Britain.

According to legend, this tomb holds the secrets to time travel.

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

A bronze bust commemorates the heroism of the secret agents who led covert operations against the Nazis.

A quiet, semi-secret square with statues of Mahatma Gandhi, Virginia Woolf, and a conscientious objectors stone.

This ancient oak plays host to carvings of magical elves, gnomes, witches, and other creatures prominent in local folklore.

This museum inside a museum tells the story of London's timepieces.

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

The ritual has been performed uninterrupted for nearly 700 years.

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

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

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

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

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

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

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

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

A clock designed to run with perfect accuracy for 10,000 years.

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

An unusual round church in London with a Templar past.

A special shop catering to the needs of things that go bump in the night, and also helps kids become writers.

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