I've mentioned Krypton before, but that's not the only planet in the DC Universe that has a lot of crazy locations. Check out the map of Rann, I talked about in this old post. Here are some highlights:
Dancing Waters of Athline: A field of high-power geysers whose sprays are shaped by strong winds.
Flaming Sea: Flames sprout from the surface of this body of water.
Illsomar: A ruined city where Nimar, a megalomaniacal, super-intelligent energy being that resembles a gigantic, Bohr-model atom has taken up residence. He is able to animate humanoid figures of metal, stone, and sand to serve him.
Kryys: A city of ice in the polar regions.
Land of A Thousand Smokes: An area containing numerous fumaroles.
Old Reliable: A sinking island in the Sea of Ybss; a source of the rare metal orichalkum.
Samakand: An advanced city that exists outside of conventional spacetime and only appears once every 25 years.