If you missed any of the burners the first time through the level, you can return here after beating the game. At that point, 3 fast travel camps appear in Syria. The one in this room is the Syrian Tomb Base Camp. See the note on Revisiting This Level in the main walkthrough.
As you enter this area...
...look to your left to spot an incense burner (1/7) hanging in a high alcove.
Shoot it to initiate the Challenge: Hang 'Em High. You must now find and destroy six more of these to beat the challenge.
The next incense burner (2/7) is in a similar alcove directly opposite the first one.
NOTES: You can still shoot the first 2 burners after this room is flooded. Swim across the pool to the ledge in the northwest corner. Climb out of the water and shoot the burner from below. Then face out across the pool to shoot the second burner. Later you'll unlock a skill called Eye for Detail that will make challenge objects glow when you press Survival Instinct so they're easier to spot.
A bit later on, when you reach the area at the base of the tower, climb onto the fallen pillar that slopes up to the right/south. From here you can see the next two incense burners (3 and 4/7).
From the spot where you find the document #2, look up at the north side of the gilded tower to spot the next incense burner (5/7). Shoot it for the challenge.
Still standing where the document was, turn around to find the next incense burner (6/7) hanging at the top of the vaulted alcove.
Finally, after climbing into the tower and picking up document #3, jump out onto the freestanding pillar, pull up, and turn left.
The final incense burner (7/7) is hanging directly ahead. Shoot it down. If you have destroyed all of the others, you'll complete the Hang 'em High challenge and receive 150 XP plus 2,000 Expedition Credits if it is your first time completing this challenge. If you missed any of the burners, you can either backtrack for them or return to Syria later after beating the game.
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