[2019] Where are dungeons.

Dig down into the ground with your miners. Most of the game world is below you and there a bunch of dungeons. The patch after today's, I'll be adding many more too. :)

As for the overworld, we actually haven't really started on overworld exploration yet. Migration is a method to start a new settlement, not really a way to explore because you can't currently go back to the old settlement. We have plans to add a lot more overworld map options like scouting, trading, invading, etc.