I was building a ton of underground caverns when I first got the game, back last winter when I was still kinda depressed.
Now, feeling the exact opposite of depressed, my old underground base in my new world is abandonded in favor of an above ground one. I found a sort of upside-down mountain: It was connected to the ground by a 6x2 rectangle, and grows bigger until the top looks like the base of a mountain, uprooted and balanced upside down. I've built a castle at the top, and now it looks epic.
Now, feeling the exact opposite of depressed, my old underground base in my new world is abandonded in favor of an above ground one. I found a sort of upside-down mountain: It was connected to the ground by a 6x2 rectangle, and grows bigger until the top looks like the base of a mountain, uprooted and balanced upside down. I've built a castle at the top, and now it looks epic.