The Pope’s secret escape route.

Jesus' footprints and the first catacombs in the world.

Stuck in the middle of a modern Madrid city block are the remains of a 19th century sports complex.

An unusual round church in London with a Templar past.

This luxury shopping lane has been protected by its own tiny police force for over a century.

London's smallest police station is barely the size of a phone booth.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

Claiming to be the oldest hat store in the world, this historic haberdashery had a hand (and a head) in the creation of the Bowler.

Commonly acknowledged as the only public monument to the Devil himself.

In the fictional world of Kcymaerxthaere, celestial wonders marked a portal to a powerful route of travel at this site in Madrid, Spain.

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

Museum dedicated to the terror regimes of Hungary.

Budapest's Communist-era statues, banished to the suburbs.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

An ancient Egyptian temple in the middle of Madrid, Spain.