Can anyone advise me a mod that has a lot of secrets, for example: a castle/mansion/cave/watever with a LOT of secret passages/rooms/ and the like... please...

Edit - except castle almgard and mournbrake mansion

Castle Glennvar... I hope it will satisfy your hunger for secrecy

thnx, ill check it out

You can only truly find what you're looking for by creating it yourself.

That's the truth - and has worked for me, trust me.

I make all of my houses on Oblivion.