You see a short hallway that ends in another door. Opening that door reveals a room where the lower four feet of the walls are covered with crude drawings in mud, blood and paint. Most of the drawings show goblins engaged in some sort of violence against humans, horses or dogs. One picture on the north wall is at least three times the size and complexity of the other scrawlings.
This images shows Thistletop from the side, the goblin stockade perched atop it like a crown. A cave has been drawn into the center of the image, and looming inside is what appears to be an immense, muscular goblin with snakelike eyes and a dogslicer in each taloned hand. If the scale compared to the rest of the drawing is to be believed, this goblin must be at least thirty feet tall.
To the south is another door.