A geological mystery on Camelback Mountain.

This striking public art installation is suspended above a public park, designed to gently move in the breeze.

A pair of giant roadside arrows are all that remains of a former Route 66 trading post.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

One of England's most famous churches hides a pair of little known architectural treasures.

The prototype for all Nazi concentration camps.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

Horrifically creative torture devices and shame punishments line the walls of this chilling museum.

This bridge was constructed from the rubble of the infamous Bastille.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

A six-ton wedding present for the King of the Scots.

The final resting place of soldiers' loyal canine companions.

The most loyal of little dogs, or a Victorian era publicity stunt?

A 18th century graveyard and its astonishing cortege of macabre iconography.

Famously misunderstood wonder of the ancient world

A real-life Professor Snape once taught in this Welsh university building, which students of course nicknamed “Hogwarts.”

The largest stone circle in the world has ended up bringing up more questions than it has answered.

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

The oldest working mechanical clock in the world.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

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

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.