An American ghost town hides along a side street in Scotland's capital.

Human-made caves excavated to hide a secret society of wealthy pagans.

This tiny little cave was said to have been a refuge for a saint with a glowing arm.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

An English artist has turned an unassuming ex-council house into a time-lost house of mystery.

A statue in the heart of Edinburgh honors a bear that served in the Polish military during World War II.

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

A house of bones — but nobody is quite sure to whom they belong.

Charles Babbage's proto-computer, painstakingly brought to life.

Eclectic final resting place of the controversial explorer.

A familiar otherworldly creature guards this 12th-century Scottish abbey.

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

This abandoned asylum in Wales might look haunted, but it's still beautiful.

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

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

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

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

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

An Oxford museum where visitors can have tea with the Mad Hatter and climb through the wardrobe to a fantasy land.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

Tiny effigies of the victims of Edinburgh's famous Anatomy Murders.

The final resting place to 300 Victorian-era pets hides inside the city park.

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

Hear the quietest sound from across the dome.