Art Deco and “Wrenaissance” mash-up, this recently restored royal residence has been home to kings and comes with secret monkey passages included.

This star-shaped artillery fort protected the mouth of the Thames from the 16th century to the Second World War.

This curious Tudor-era castle was once home to Napoleon's greatest adversary, the Duke of Wellington.

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

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

This macabre monument atop an ancient well gives a nod to a brutal episode in Scottish clan history.

19th century tunnels burrowed under Liverpool.

Created as a punny statement about genetic engineering this monstrous hybrid statue has become a beloved icon.

This bridge is the first to be made entirely from iron, but designed like it was still made of wood.

The remains of a 13th-century stronghold built by the Welsh prince known as Llywelyn the Last.

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

Arthur, Merlin, and Guinevere are among the largest and oldest satellite dishes on the planet.

Now a memorial to merchant sailors and Titanic victims, this medieval church was destroyed by bombing raids in 1940.

A half-mile-long stretch of medieval forts built after a devastating pirate attack persists amid the modern port city.

Discovered on a shipwreck after more than 400 years, this Renaissance ratter tells a very waggly tale.

This colossal war machine is now a living museum dedicated to underwater warfare.

The last resting place of the famous Native American princess is marked by a haunting monument.

This one has sailed five times as far as Sir Francis Drake's famous ship.

The charming collection illustrates life in Lincolnshire in the 18th through 20th centuries.

Legend says this demonic carving inside a medieval cathedral was one of Satan's minions.

The oldest of the three remaining bridges in England with buildings on top of them.

The world's first military tank was designed in this English city amid the stalemate of WWI trench warfare.

The near loss of the stately fireplaces at this medieval castle spawned some of Britain's most crucial historic preservation laws.

An engraved stone in a village church claims to be the grave of a minuscule folk legend.