Know of any good survival maps? (not challenge maps)

I've been looking for this, well for years actually. Once in a while I'm tempted to pick terraria back up. The only thing stopping me, is that I find the normal world gen rather boring, and I'm never lucky enough to get any unusual things, such as massive layered overhangs, or big open spaces in underground jungle.

I've also been looking at maps that alter the way the landscapes look drastically, but they all seem to be outdated, or just really some presentation of building skill.

I guess the best way to put it, is that I'm looking for a world, that is more interesting than the normal vanilla world gen, that isn't a challenge map (survival island, floating islands, quest, and story maps), or maps with prebuildt castles and such.