What are some interesting locations you’ve made for your Superhero World?

This ranges from things such as Cities (Gotham, Metropolis, Astro City), Countries (Themysciera, Latveria, Wakanda) or even Planets & Alternate Dimensions (Krypton, Apokolips, Nowhere, Negative Zone).

I’m currently working on remaking my world (to add in my new ideas & finally sort out the lore) so I only have a few but my main superhero locale is Celeste Canyons, a hub of various different cities on an island nation known for its high level of technological innovation, being the headquarters of the superhero analysis & recon org ARCHON & having the worlds highest number of Alien Encounters (possibly due to the rare resources hidden in the canyons that have an unusually high number of meteor impacts or just because the Aliens don’t know when to stop trying to invade).

But what locations do you have?