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

This remarkably intact, 260-year-old cargo ship is only visible at the lowest of spring tides.

A fantastic castle rumored to be the birthplace of King Arthur.

The last four extravagant street signs of London's historic banking street.

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

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

Two plaques commemorate the site of Shakespeare's first theatre.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

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

Hear the quietest sound from across the dome.

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

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

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

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

A tilted half-timbered house from 1672 is built into a salvaged segment of a medieval wall.

A statue honors the local legend that the devil helped build St. Mary's church after being tricked into thinking it was going to be a wine bar.

When a medieval fire claimed the original St. Stephen’s Cathedral, it sparked a pattern of unquenchable organ building.

On the highest peak in the Harz Mountains, science and the occult faced off in a failed attempt to turn a goat into a boy.

A peculiar trapezoidal building covered with wonderful humorous reliefs.

This cheeky statue of a man defecating gold coins graces the facade of a medieval guildhall.

The monumental home of Prussia’s eccentric "Cannon King."

The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

This magnificent museum claims to house the cranium of a disciple and the skull of a pope.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.