Just wanted to share my new favorite way of building cities!

[Ouroboros]

You know those huge rivers that go into and under the mountain? Making "underground docks" by placing bridges on either side along the river, then houses built into the "riversides". Bridges to connect both sides at strategic places.

Just hoping this would inspire someone to try It looks really cool and aesthetically pleasing having an underground river city. Torches and lightning makes it extra cozy. The entrance to your base is literally the river cave entrance that goes into the mountain. Makes it both easy and adds some new challenges to defend.

Not sure if this is something many have "discovered" yet. But a "steampunk" like underground river city is really cool imo.

[Canute]

Yeah, underground is an nice setting, you should try out the
Cave Biome
https://steamcommunity.com/sharedfiles/filedetails/?id=2259124387
Beside a few lightspot's anything is dark.

Alpha Biomes, got some unique enviroments too.
The Forsaken Crags is pretty dark too, not real cave feeling more like apocalypse aka nuklear winter.

But if you need a challanging Biome, you should look into
TiberiumRim
Constant fight against the tiberium, they even consume you unprotected wall's.

[Ukas]

But a "steampunk" like underground river city is really cool imo.

I really like how you describe it, might try this as something different with the next colony

[chimpfive]

Nice work!