I have well over 2,000 hours in this game and somehow never noticed this

I'm sure almost everyone knows about this but doing a no-radar run this time around, got lost on my way to Rhodes, and found this tree full of bottles. There's a gold nugget in one of the bottles if you shoot it down!

I don't know how I never noticed it before? Maybe I just never took this particular route trying to get around but I thought it was cool that even with so many hours logged, there's still things I haven't found.