This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

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

A memorial for public executions that dates back to the 14th century.

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

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

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

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.

There's an exclusive Beefeaters pub hidden in the Tower of London.

An architectural oddity hides in plain sight on this iconic London bridge.

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

Where a staggering 747 ships were constructed during World War II.

A vast city of the dead, where the deceased outnumber the living by more than a million.

The peaceful gravesite of a rugged wild west gunman echoes the touching story of his last days.

From the sky, a kaleidoscope of color brightens the grey landscape of the San Francisco Bay.

A trail weaves through the verses of a poem illustrated by stone sculptures inspired by Native American pictographs.

This redwood is a historic landmark, a town’s namesake, and the dancing sideline symbol of Stanford University.

Guarded by the Angel of Grief, the Stanford family tomb attracts an odd mix of halloween revelry and somber contemplation.

Rodin's famous depiction of Dante's 'Inferno', amidst a sculpture garden of many of his other works.

A hidden world of exotic succulents and cacti.

A sudden forest of traditional Papua New Guinean art works is hidden in a corner of Stanford University.

The Internet Age began with a transmission from this biker bar.

The world’s first stop-motion film was created on the racetrack outside this building.

This old-world mansion with lush gardens is a gem in the heart of Silicon Valley.