Geckzilla.com - Art by Judy Schmidt
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Unlikely Cities (2009)

Top-left: Giant, industrial butte city
Top-right: Subterranean floating island city
Bottom-left: City in giant caves on a famous red planet
Bottom-right: Root village

Hmm, they almost all ended up underground. What can I say? It’s easier to draw glowing dots than it is to draw actual structures.