Ten 25-foot-tall, beehive-shaped kilns, abandoned in Death Valley.

Spiral labyrinth hidden in the hills above Oakland, CA.

The location of the last stand of Charles Manson's doomsday cult.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

One of the ghostly stops along Route 66.

Quite simply the largest tree in the world (by volume).

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

Eons old volcanic activity created one of the most stunning rock formations in the United States.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

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

This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

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

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

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

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

Bronze sculpture celebrating the relationship between Churchill and Roosevelt.

Dictionary Johnson’s favorite feline.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

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

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

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

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

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.