Georgie writes:
"Ruins" is a 10-second Blender Geometry Nodes test video showcasing how Blender can handle massive amounts of geometry through Geometry Node. This video was made using a modified version of Citigen--a paid Blender addon--and assets from Evermotion. Rendered in Cycles, only 30 samples were used per frame. I'm sure you would have more decent results from more samples, such as 300 samples.