I don't have any personal ghost encounters but I knew a couple of people who did at a college where I used to teach in the 1980s.

Augusta College in Georgia is built on the site of an 18th century farm; there's a cemetary on the western edge that has graves that date back to the Revolutionary War. The core of the campus used to be a arsenal before, during and after the Civil War and looked like a little fort with a wall around it and buildings incorporated into the wall. One of the buildings was the commandant's home. According to legend, one commandant had a wife who was a real clothes horse. College administration staff working in that building would hear someone rummaging and rattling through the closet on the floor above them but there was no one upstairs and the closet was empty. Another story from that same building involved a nephew of a commandant who was generally disliked. One day, when he was coming up the back steps for dinner, he was supposedly shot dead. Again, the staff working in that building would hear someone coming up the back steps only to find no one there.

The student center in the 1980s was built on the site of and incorporated parts of a building that had been used as an infirmary during the Civil War. Cold spots and people in old clothing that weren't there when you looked again were a common occurance. Some people even reported hearing screams and moans of pain. No one liked to be in that building at night unless there were a lot of other people there.

The most interesting story I heard, however, was from a professor in the literature department. He was an older guy and not the 'fanciful' type. He told of leaving the Fine Arts building's faculty parking lot one night and seeing someone walking across the soccer field along Walton Way. It was dark and a bit foggy but he could see that the guy was wearing an old-fashioned greatcoat which was somewhat unusual. He watched the man pass between some old oak trees and eventually disappear into the night. He didn't think anything more about it until the next day when he saw that there was a chain link fence across where the guy had walked with no gate or opening. There was no way a physical being could have passed that way.