An eccentric 18th century naval officer built a ship's quarterdeck on his roof, the inspiration for Mary Poppins's "Admiral Boom."

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 first tunnel to be dug beneath a river, repurposed as an art and museum space.

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

Abstract dinosaur models in London.

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

The remains of Crystal Palace Great Exhibition of 1851.

Rebuilt remains of a temple to Roman god Mithras.

An unusual round church in London with a Templar past.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

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

Eighty million natural history specimens call this gargantuan museum home.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

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

Historic funicular railway, believed to be the shortest railroad in the world.

A field in which God and his son Jesus purportedly appeared to a young farm boy named Joseph Smith.

14th century Norse artifacts in Northwestern Minnesota could have proved a Viking landing before Columbus.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.