Very interesting thread. Thanks to all of the contributers.
Favorite: Philadelphia (ok, I'm biased. So sue me.
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Least Favorite: New Orleans. Has all of the charm of a warehouse and a bad warehouse at that.
I also enjoyed Sacramento's and Salt Lake City's.
BTW, here is a picture of Philadelphia's Old City Hall built in 1791, used prior to the construction of the Second Empire structure at Broad and Market. It was actually home to the Supreme Court until 1800.
Photo Credit: Wikipedia