Aspen
A futuristic City nestled on a rocky island in what some hypothesize to be the pacific northwest of Earth. But it's been so long that no one is quite sure of the exact location. As far as anyone is concerned, Aspen is the last city on Earth.
The city has a retractable "shell" made of iridescent, glass-like material. The colours are magnificent when the light catches it. Money is no object as the City provides. As there is no need for work, the people spend their time on art, research, and any other pursuit they can imagine.
No one leaves the City. The average lifespan is 308-years-old.
Sometimes, a truly remarkable creation will come to be. Envious, some are willing to hire thieves to steal art to pass off as their own. The thieves don't require payment. For them, the thrill of the hunt is all they desire.