The wreckage of an old coastal trading vessel is only visible at low tide.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

A sweet symbol marks the place where torturous executions were once carried out.

The fountain marks the area where hundreds of accused witches were burned at the stake.

This cannonball embedded in the side of an Edinburgh house once served a surprisingly pedestrian purpose.

Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

A long-abandoned relic of World War II.

Quaint, disturbing, and macabre objects are all on display at this intriguing collection of medical instruments from bygone eras.

Sometimes an island, sometimes a rocky outcropping connected to the world by a tiny suspension bridge.

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

It is said the legendary wizard once lived in this sea cave beneath Tintagel Castle.

A whimsical cottage from the 1300s with a preserved Victorian-era post office inside.

The largest greenhouse in the world is home to over one million types of plants.

A rare survivor from the age of plagues.

According to the Soldiers Account Book, the village of Odiham is home to Thomas Atkins, whose name became shorthand for all British soldiers.

This peaceful oasis appears dreamy, but it's also the site of a nightmarish legend.

It's believed King John of England stayed at this 13th-century castle before riding off to sign the Magna Carta.