The one where you find Sandra ? Go to one of the fort's buildings (the one with a stairway) and talk to the soldier near the crack in the wall and go in.
oh yea now i remember thanks. It been so long since i play this game again that i forgot the places thank you (also there's like the tombstone in witton when you press it says something like you pushed something and i did this on other tombstone in witton so i thought there's a hidden cave xD)
