It's the lookout tower below. You can't shoot from a single place - you take pictures from four different positions, distant a few meters one from another.
I know there logically must be problems on nearby trees (distant only tens to hundreds of meters) but I'd accept
enblend retouching/blurring here.
What do I need to prevent are bumps on the horizon. There shouldn't be any as it is tens of kilometers away!
Note 1: I hoped I could add control points manually (without help of
Hugin's CPFind) - on the horizon only - but the results have still been poor.
Note 2: Taken without a tripod. I assume it's not a problem though as I've taken tens of other panoramas handheld and they've been stitched perfectly in