The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

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

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

Descend 2,030 years into the past in an ancient tunnel built to support Jerusalem's most famous wall.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

The embalmed remains of the communist leader lie within a custom crystal coffin.

The most famous location in China was home to whole dynasties worth of imperial rulers.

The floor of the oldest surviving synagogue in the Americas is entirely covered in sand.

An early-19th-century hotel with a past that is steeped in the Civil War.

An eerie smiling woman looms above the granite tombstones.

One of Savannah's oldest and most haunted cemeteries, featuring graves desecrated by Sherman's Union Army.

The oldest experimental corn field in America is still creating better ways to grow crops.

The taxidermied remains of a once-great parrot.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

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

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

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

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

An incarceration museum on the spot of possibly the oldest prison in England.

Hear the quietest sound from across the dome.

One part local history, 99 parts gruesome haunted house.