The Tibetan Ceremonial Axe is the sixty-fifth treasure that can be found in Uncharted 2: Among Thieves.
The Tibetan Ceremonial Axe is found in Chapter 18 - Heart of Ice. After you climb up a set of three gears, you will use a pole to swing yourself to small ledge to left. But before you schimmy around, look to the right while hanging from the ledge. You'll see, clear-as-day, a statue with a glowing eye. That glowing eye is a treasure. Pull yourself up in front of that statue, shoot the treasure down at point-blank range, and claim your prize.