Need help with riddle

Riddle says “The tunnel atop the wooden staircase holds an ancient secret, seek it out then lift a beacon”
I have lifted my lantern almost everywhere around the tunnel, i need help

@xtgx-ice I believe the spot you are looking for you can get up to by going up the ramps on the big rocks on the west or southwest side of the island. Also Rare Thief has top notch riddle guides on the good ol' interwebs. Check out their site and their SoT app.

@venomous-sloth7 I found the tunnel, but the riddle was confusing because it wasn’t really telling me what this “ancient secret” was. But i did figure it out by apparently running into one of the tunnel walls and sitting there with my lantern risen, for some reason

@xtgx-ice Glad you figured it out. I think I was on the wrong spot anyway. Check Rare Thief out though. They have very helpful guides for the game if you get stuck.