Sharn
Sharn is a metropolis in the Dungeons & Dragons world of Eberron, which is basically "magitek New York City". Its most iconic trait is that it's built under a Manifest Zone to Syrania, the Azure Sky; the extraplanar energies seeping from this point augment and empower all spells relating to air - or, specifically, to flight and levitation. This has let the occupants build the fantastical equivalent of skyscrapers, and the richest part of the city literally floats in the sky over the city like a giant masonry balloon.
Gallery
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The city's coat of arms
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Cut-away map of the City of Towers