This precariously perched fortress was once ruled by a crow-worshipping baron.

Also known as Rye Castle, this 13th-century fortification later became a prison and held one of Rye's most famous criminals.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

A striking 12th-century-style castle built on the edge of a cliff.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

A fantastic castle rumored to be the birthplace of King Arthur.

A petite castle folly in the English countryside.

There's a labyrinth of medieval chambers hidden deep below a 15th-century pub.

The oldest bar in Missouri is hidden within a limestone brewery cellar more than 50 feet underground.

An engineering wonder at Pillnitz Castle protects a precious 230-year-old flowering shrub.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

The elaborate clockwork contraptions in this Scottish gallery create small worlds of whimsy and horror.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

A church that bred legends, and served as an inspiration for the Da Vinci Code.

This series of Scottish caves has no clear purpose other than baffling historians.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

The fountain marks the area where hundreds of accused witches were burned at the stake.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

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

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.