Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Breathtaking and huge 430 year old maps of Italy.

Edinburgh's oldest statue hides within a parking lot behind the city's iconic cathedral.

The Scottish Reformation leader's grave was paved over and is now a parking lot.

The location of this historic castle was inspired by a donkey.

The 20th-century chapel’s intricate woodwork includes amazing details, most notably angels playing bagpipes.

The heart of a Scottish legend had a centuries-long journey before reaching its final resting place.

The final resting place of soldiers' loyal canine companions.

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

This picturesque view of the Scottish Borders was beloved by Sir Walter Scott.

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

The medieval woodcut-style artwork chronicles life in medieval London.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

There's an exclusive Beefeaters pub hidden in the Tower of London.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The capital of the Cayman Islands is a center of offshore banking, but gets battered by blistering hurricanes.

If all members were present at the table, a sixth of the world's wealth would be under the same roof.

This quirky curiosity shop takes its cues from the world's bazaars.

The mastermind behind this palatial hotel perished on the Titanic weeks before its grand opening.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.