Kennedy Memorial in Dallas deserves its own post:
Directly behind the monument is a 12-story building that houses the county records office on the lower floors. The upper floors, beginning with the 6th floor, house part of the county jail complex. I was locked up on the 7th floor of that building and stared down at the monument for 3 months a few years ago.
It is without a doubt the ugliest structure ever dedicated to a person living or dead.