Do cave systems go on forever? No matter how much I explore, I seem to stumble into another unexplored region? I explore mines and caves with an OCD complex, which explains why I haven't really begun creating structures and what not. I've created a warehouse with a comprehensive minetrack system and that's about it. I have a couple of wheat farms, and less than 2 dozen farm animals. I've also deforested large areas, but feel kind of overwhelmed on how to go about building things. So I end up branch mining for diamond and find end up with an even more bloated warehouse by the time I'm finished mining out another cycle or layer from the bedrock area.
I've never found an infinite cave system, every one I've ever found has had an end to it, but sometimes they are VERY large. And then I've found horribly small cave systems too, it's random. My favorites are the ones that have underground ravines in them or huge immense caverns and openings.
I typically start with a storage area that I think is more than large enough for me, and then eventually outgrow it from all of my digging, mining, and resource hunting, and need to either expand or build another storage area. It's happening to me right now on Neocraft. I have a problem where I keep all of my dirt and cobblestone. I just can't throw it away, I mean I might need it someday. So, just like always, I end up with dozens of chests full of dirt and cobble.
I used about fourteen double chests of cobble to build my fortress on Neocraft and I was so proud of the fact that I was using it all up. But then I started digging the underground part of it, and I quickly filled them all back up and even more. I used to have an entire double chest filled with coal, but after smelting all of that cobble to make bricks, well I've been down to like four stacks of coal ever since. And that bugs me. I need to go coal mining.
Damn this game, lol.