re: Official Bloodborne Thread (spoilers)

I found that secret area where you had to fall to door. Make sure you have health vials to heal the fall damage.

To get there, as soon as you reach the top of the room with the planks, walk right and fall to the platform below. Then walk left and fall to the next small platform. Finally walk left again to fall to the platform with the door.

When I opened the door, my mind was blown. That's all I'll say. Some decent loot too.