Secret one
At the bottom of the spiral staircase in the main keep is a wooden wall. Destroy the wall.
Before:

After:

Secret two
In the room where you get the binoculars (there's a radio there too) there's a map on the wall; shoot it. Before:

After:

Secret three
There is a barrack room off the main courtyard. Between the bunks there's a depressed section of floor. Destroy this area.
Before:

After:

Secret four
After you've jumped through the shot-up floorboards, you end up in a hallway. At one end there's a bricked-up archway. Destroy this for access to a secret room.
Before:

After:

Secret five
Off the hallway with the suits of armour there is a smaller hallway, with a single room on the left and one on the right. In the left room there's portrait of Hitler. Destroy this.
Before:

After:

Secret six
In the room on the right of the same hallway, you'll see a fireplace, and opposite that two wall-mounted candelabra. The left candelabrum is tilted - "use" it and you'll cause the wall opposite (beside the fireplace) to open up, revealing a secret room behind the fireplace.
Before:

After:

The secret door open:

Secret seven
In the grey corridor just before the exit, there's two shallow archways shaped indentations on the wall. "Use" the left one, and a secret door opens in the right, revealting a spooky secret altar room.
Before:

After:

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