It’s like a half-dome panorama that was specifically created for this kind of 3d scene usage. The typical HDRI lighting image doesn’t work as well as this kind of image
Okay maybe I will be stupid here, but is it not simply a plane and an image? 
And also light ofc, or may use emmission, etc…
For nice cc0 backgrounds Pexels is a great site, but there are other similar sites as well:
https://www.pexels.com
Search for Skydomes…
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It’s not a plane, it’s a hemisphere, a skydome, with a projected environment image. It’s a form of what people in game dev call a “skybox” (which uses a cubic projection map).
So textures for it can be found by looking for those terms.
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Oh okay thanks, I see now, I thought it’s more like faked 
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Btw, I usually use an HDRI, and/or a procedural world texture. I actually use skydomes as well, but only procedurally textured.
Plus the lazy way is still an image 
It is still faked, and that brings its own set of problems if you’ve got a player moving through a game environment. 
But thinsoldier just needs it for still renders, I think, and it works fine for that.
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Well 3D is faked anyways, it is about how you fake it I guess 
I still remember old games, when you could actually see the corner of the sky
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I probably have half of all the free sky domes available on the english speaking internet. None of them fit what I want as well as the image in this sketchfab. It’s less of a skydome and more of a “anchor my fake building in realistic ground-level scenery”-dome.
I’ve seen “tree line” images for this but this is one of the few “small town environment with nearby buildings” that actually looks really good for the purpose I need. There’s a lot of HDRI lighting images that are a small town environment with buildings nearby but none of the ones I have really “fit” what I’m looking for like this one in terms of the amount of interesting stuff in the distance that you can see.
Well …you can use GIMP to make 360 Panorama Pix…or Photoshop…
and there is a ton of them free on the net…though you are right most are worthless for this type of application…
But looking at the file you posted it doesn’t even need that just a higher-rez photo would work…
Look for 180 panoramic…
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The image looks overexposed, IMO. You should turn down the strength a bit.
The page you linked to only has 2 photos from ground level. Searching “180 panoramic” only gives 1 result.
Couldn’t you just crop any 360 HDRi in half? Affinity photo, and several other programs, let you work with 32 bit EXR/HDR files
Do you know about these already? There are a number of town panoramas among them. http://texturify.com/category/environment-panoramas.html
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