The bottle can be easily seen before leaving the starting building - on one of the pillars [#1] of the main gate leading onto the streets.
Before leaving the starting building, look towards the dome roof of the museum [#2] and onto its destroyed part - the Bottle is on some rocks.
After obtaining a new sniper rifle, look out one of the windows - in the distance you should see a small square beneath a dome [#3] with two soldiers on it. The Bottle is standing beside the stairs.
As you evacuate, before jumping onto the street, look almost perfectly straight towards one of the pillars [#4]. The bottle is on top of it.
Gold Bar 1/10
Inside the first building you pass by [#1] on the left, while going along the street that you had to clear.
Gold Bar 2/10
In the first room to the right, inside the building which you have to enter as your first objective [#2]. The gold is on a cabinet.
Gold Bar 3/10
At the end of a long street [#3], right behind a crate, beside a door.
Gold Bar 4/10
Inside the room where you eliminated the first soldiers inside the building [#4] with a door blocked by a truck.
Gold Bar 5/10
On the building beside which there's a four-man patrol [#5]. In case you're playing this part silently, it's right before going down the stairs.
Gold Bar 6/10
By the crane [#6] right beside the bridge where you have to plant explosives.
Gold Bar 7/10
Inside one of the corridors of the museum [#7] - on the path suggested in the walkthrough, maximally to the left after crossing the second square.
Gold Bar 8/10
By the crane on the other side of the bridge [#8] - as you evacuate from the museum.
Gold Bar 9/10
Inside the ruins passed by on the left [#9] - not in the building but right behind it, where there's absolutely nothing left but rubble.
Gold Bar 10/10
Inside the ruined building on the right - head inside through the main entrance and pass by the stairs. The gold is right beside the next passage [#10].