The 700-year-old fortress was the site of Count Orlok's castle in "Nosferatu."

A centuries old castle atop a dormant volcano houses museums devoted to both women and witches.

On rare days, this abandoned castle's gatekeepers open its doors, revealing the eye-popping splendor hidden inside.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

Known as the Royal Palace of the Euganean Hills, this often overlooked castle has been home for multiple noble families over the centuries.

One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

This 13th century Gothic brick castle is the largest in the world by surface area.

This imposing modern citadel started out as a home renovation project.

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

This ancient Spanish castle sits high upon a hilltop.

An officers prison camp believed to be impregnable by the Germans saw over 30 successful escapes.

Centuries of warfare, tragedy, executions, and poetry come together in this 13th-century fortress.

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

This Arab fortress was once the largest citadel in Western Europe.

A magnificent, long-abandoned castle built in the wake of the reconquest of Spain.

This striking royal residence is the largest Renaissance-style castle in Scandinavia.

This Danish castle is supposedly haunted by a woman too independent to not be a witch.

This castle has links to Portugal’s founding and struggles for independence.

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

This Norman castle has been the scene of assassination plots, religious persecution, and Nazi conspiracies throughout its long history.

A beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.

This foreboding medieval castle was twice besieged by barons rebelling against the English king.