These pretty kitties killed and ate as many as 135 railway workers.

This historic hotel invented the chocolate brownie.

A mysterious shape catches the eye in this 16th-century painting.

A gruesome and mysterious ancient sculpture of a pagan deity from the Roman occupation of Celtic Britain.

This bewitching Babylonian goddess haunts a hallway of the British Museum.

This mysterious and unique painting is filled with symbolism.

The next-door homes of two very different musicians, George Frideric Handel and Jimi Hendrix.

This macabre painting of a Shakespearean scene looks like something out of a nightmare.

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

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

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

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

A naturally mummified 2,000-year-old man.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

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

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

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

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

This underfoot portrait is the work of a disgruntled painter inspired by a tragic poem.

The site of the "Bone Wars" between two rival paleontologists during the dinosaur rush of the 19th century.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

This razorback ridgeline has doubled as a scenic drive since the early 1900s.