Arch and stack displacements
Made by The Giblets of Jesus
This prefab was created, mainly from my own boredom, but also I don't ever recall anyone ever making something like this before and I thought it might be an interesting prefab to make.
While making the arch formation, I also made a stack displacement and noticed that if the arch was removed from it's cliff-side and textured different, could probably serve rather nicely as another arch in a desert environment (Screenshot 2, though it is quite a wet desert isn't it?).
If you do decide to use this prefab in one of your maps, I'd like to be credited as appropriate and while not required, it'd be nice to told so I could see how people have used it.
Oh yes, and if your wondering how big these things are, the shed atop the first arch can be found here and is about 128 - 192 units in height:
Cluttered shed prefab
Image sourced from the Durdle Door wikipedia article