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the US. not just wreathes: whole-ass trees and specially-painted beams. i can speak for the mid-atlantic region; basically, any building that has a ground-breaking ceremony might also have a topping-out one.

https://slate.com/human-interest/2013/12/why-do-construction...

https://www.designingbuildings.co.uk/wiki/Topping_out

Personally, I'm in Poland but I've seen them in other countries too. That's the most recent one from my city: https://radiopoznan.fm/informacje/pozostale/to-nowy-najwyzsz...

The US for one, where it evolved into a Christmas Tree at the top upon "topping out".

Is that done just at Christmas or all year round?

Year round. And it's just a pine tree. It's not decorated for Christmas or anything.

The town in Scotland nearest to where I live, Burntisland, has docks and they have a huge crane there - at Xmas the company puts a Christmas tree on top of the crane about 65m or so up.

It's quite bizarre as when it's dark (and days are quite short in Scotland at Xmas) you can't see the crane just this lit up Xmas tree hanging in space above the town. It's very cool.

All over Northern Europe surely.