This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

Conspiracy theories and occult legends surround this mysterious natural rock formation.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

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

Science fiction's grandfather has a fittingly marvelous tomb.