A mysterious pre-Incan ruin believed to have miraculous healing powers.

A remarkable geological formation resembling a forest made of stone.

Extraordinary rock formations in open Peruvian fields.

A colorful Peruvian city of the dead.

A jungle cave in Peru of unknown depths, otherworldly sounds, and strange nocturnal birds that navigate by echolocation.

This scalding hot river was thought to be a myth until one geoscientist made it his quest to study the mystical waters.

This elegant Colombian fortress was one of the torture headquarters for the Spanish Inquisition.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Museum preserving torture methods from the past.

Macabre museum devoted to historical Viennese murders.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

A five-story homage to tea times past.

"Purveyors of traditional sweets and vintage treats."

Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.

This may be the last of London's wooden pavements, which were once a common sight in the city.

On the eve of a condemned prisoner's death, this bell rang 12 times outside their cell.

This intriguing Bronze Age artifact spent centuries hidden within a Welsh faerie hill.

A gruesome and mysterious ancient sculpture of a pagan deity from the Roman occupation of Celtic Britain.

A faded reminder of what was once a common sight in London during the Blitz.

This East End pub gained notoriety as the site where gangster Ronnie Kray publicly shot a rival.

This innovative steam machine was no doubt the most famous of the pioneer locomotives.

It's a mystery why these remains were found with no traces of their bodies in sight.

This pub was 238 years old when it decided to revamp its image: It started serving Thai food.

The gigantic skull of a long-extinct species that once roamed the forests of England and Ireland.