i have dreams of dozens of recurring places that, as far as i know, don't exist. not sure how common it is? i've got malls, museums, amusement parks, rivers, lakes, public parks, ocean waterways, dunes, construction sites, homes, several different neighborhoods (both residential and industrial), and i know them well enough to recall them clearly while awake as well... if i were an artist, i'd attempt to draw them. (hrm, maybe i will one day?)