Tibetan Mask
From WikiRaider
The Tibetan Mask appears in Tomb Raider II in the level Catacombs of the Talion.
Location
The first mask is located inside a cage in the first large room with the pool and Snow Leopards. Lara first needs to get down from her initial position and then climb a ladder in order to get to a switch that opens the cage.
The second is found in the area with the giant firepot, near the frozen pond.