We all want to find a secret lever that opens a bookcase. It is a childhood fantasy, fueled by Scooby-Doo and Gothic novels. But in castle history, secret passages weren’t for fun, and they weren’t for smuggling contraband wine. They were a matter of life and death. Architects designed castles with deception in mind. From invisible rooms to trick stairs, the building itself was a machine designed to hide the Lord and kill the intruder.
The Priest Hole: A Masterpiece of Camouflage
The most famous secret rooms in Britain are Priest Holes. During the Protestant Reformation under Elizabeth I (late 16th century), being a Catholic priest was high treason. If caught, the punishment was being “Hung, Drawn, and Quartered.” Catholic families in manor houses and castles built tiny, secret hiding places to hide visiting priests (Jesuits) from the “Priest Hunters” (Pursuivants)—soldiers who would tear floorboards up and measure walls to find discrepancies.
Nicholas Owen, a master carpenter (and later canonized as a Saint), was the genius behind these. He was a small man (nicknamed “Little John”) who spent his life building hides.
- The Locations: He built hides under staircases, inside fireplaces (where you could only enter if the fire was out), behind false walls in attics, and even inside the garderobe (toilet) shafts.
- The Deception: Owen used trompe-l’œil. He would build a false hide that was easy to find. The soldiers would find the empty hole, shout “We got it!”, and stop searching. Meanwhile, the real Priest Hole was deeper inside the wall, safe.
- The Conditions: Priests sometimes had to stay in these holes—often no bigger than a cupboard and unable to stand up—for days or weeks while soldiers occupied the house. They had to remain perfectly silent, with no food or toilet, breathing through a quill pushed through a crack in the masonry. At Harvington Hall, you can still see some of the finest examples.
Baddesley Clinton: The Sewer Escape
At Baddesley Clinton (a moated manor house), the secret passage was a sewer. The Great Hall had a secret shaft that led directly down into the medieval sewer system. In 1591, when priest hunters arrived, Father John Gerard and others dropped into the sewer. They stood in waist-deep water/muck for hours while the house was searched. The smell masked their scent from the dogs. They survived.
The Sally Port: The Back Door
Every castle has a main gate—the Portcullis. But most also have a Sally Port (or Postern Gate). This is a small, nondescript door in the castle wall, usually hidden near the foundations or behind a buttress, often barely large enough for one man to squeeze through.
- Attack: It was used for “Sallying forth.” The defenders would wait until the besiegers were asleep or distracted, then rush out of the Sally Port to burn their siege towers or raid their supplies, then retreat before the enemy could react.
- Escape: It was also the emergency exit for the Lord if the castle fell. King Charles II famously used secret doors and disguises to escape after the Battle of Worcester.
The False Step (Stumble Step)
A subtle but deadly trick used in spiral staircases. Medieval architects would sometimes build a single step in a long flight that was slightly uneven—either higher or deeper than the others.
- The defenders, who lived there and walked the stairs every day, had muscle memory. They knew to skip or adjust for that step automatically.
- Attackers, rushing up the stairs in the dark, usually carrying swords and shouting, would hit the uneven step and trip. In a sword fight, a stumble is fatal. The momentary loss of balance allowed the defender at the top of the stairs to strike.
The Colditz Cock: WWII Secrets
The tradition of secret castle passages didn’t end in the Middle Ages. Colditz Castle in Germany was used as a POW camp for “inescapable” Allied officers during WWII. The prisoners (who were often bored engineers) treated the castle like a puzzle.
- They built false walls in the attic to build a glider (the “Colditz Cock”).
- They dug tunnels through the solid rock foundations.
- They hid radios in hollowed-out bedposts. The French officers even discovered an ancient medieval drainage tunnel that had been forgotten by the German guards, using it to access the wine cellar.
Myth vs. Reality: The Long Tunnel
Legends of “secret tunnels” connecting castles to nearby abbeys, pubs, or the coast are overwhelmingly common. Almost every village in England claims their local castle has a tunnel to the church 3 miles away. 99% of them are myths.
- Ventilation: Building a 3-mile tunnel without modern ventilation is impossible; you would suffocate.
- Engineering: Tunneling under the water table without pumps is impossible. Usually, these “tunnels” are just large drains or sewers that locals rediscovered and romanticized.
The Secret of the Library
The “bookcase that opens” is mostly a Victorian invention. In the 18th and 19th centuries, Gothic revivalists added secret panels to their libraries just for the fun of it, to thrill their guests. However, real castles often had “Spy Holes” or “Squints.” The Lord would have a secret listening tube or a peephole built into the wall of the Great Hall so he could listen to the gossip of his servants or guests from his private solar above. Knowledge was power.
Where to Find Priest Holes Today
Several English manor houses and castles preserve their priest holes for visitors.
- Harvington Hall (Worcestershire): The finest surviving collection of priest holes in England. Nicholas Owen himself is believed to have built many of them. The house has seven identified hides, including one concealed inside a garderobe and another requiring the visitor to remove a beam to access. It is the definitive site for anyone serious about this history.
- Oxburgh Hall (Norfolk): A moated manor house with a priest hole concealed in the thickness of a staircase tower wall. The Bedingfeld family, who built it, remained Catholic through the Reformation.
- Baddesley Clinton (Warwickshire): The moated manor where the sewer escape took place. The entry shaft is still visible in the Great Hall floor.
- Coughton Court (Warwickshire): The home of the Throckmorton family, connected to the Gunpowder Plot. The gatehouse tower contains a priest hole where family members waited for news of Guy Fawkes’s attempt in 1605.
Conclusion
A castle is a machine designed to deceive. It presents a face of brute strength—thick walls, iron gates—but its survival often depended on the invisible. From the priest holding his breath in a cupboard to the Lord slipping out the back door into the night, the most important room in the castle was often the one you couldn’t see.