I’ve traveled all throughout our space, and beyond.  I find the really old colonies, the modern core worlds, to be some of the most interesting worlds we have.  They were colonized before gravtech was available, and they look like it.  They have city streets, not rooftop parking ramps.  They’re filled with twenty story buildings scattered all over the landscape, surrounded by suburbs, with very few of the modern five hundred story towers.  I like them.