i don't know of any free city skydomes, but you could always get out of the house and make some yourself i guess. or if you hate fresh air get or make some 3d models and make the skydomes inside a 3d app.
I love this app, http://research.microsoft.com/en-us/um/redmond/groups/ivm/ICE/
Grab a decent camera, go outside and slowly rotate and take a bunch of pics, make sure you get everywhere, and just throw it all in that app and your done, I've used it for a lot of different things, I even made a spherical map of my room
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Grab a decent camera, go outside and slowly rotate and take a bunch of pics, make sure you get everywhere, and just throw it all in that app and your done, I've used it for a lot of different things, I even made a spherical map of my room