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

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.

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

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

Tucked away in a London Tube station, this 1920s linear clock shows the time across the world all at once.

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

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

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

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

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

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

The Great Fire of London and the regulation of one-way streets both started in this alley.

The commemorative stone column conceals a secret laboratory.

Only a few pieces remain of the structure that carried people and goods across the Thames for some 600 years.

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

The world's largest collection of ship figureheads includes figures from legends and history alike, from Sir Lancelot to Abraham Lincoln.

The handiwork of a underdog clockmaker who solved an impossible problem for an Empire, and forever revolutionized seafaring.

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

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

A rare example of this century-old British tank stands near the center of town in Ashford.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

An avant-garde artist is survived by his seaside garden.