Residual - Residual Hauntings are "recordings" of an event in time that are left at a location, that are played back at a later time. Many hauntings are thought to be residual in nature (foot steps in hallways, battles on battlefields, seeing someone walking down a certain staircase, etc.).  They are endless loops of the same scene being played over and over, and they are usually always experienced in the same location. 

A couple ways these impressions are left on a location is: A traumatic event happening at the location, or by someone doing an action over and over at a location, causing it to be imprinted there. A traumatic moment in time leaves an indelible impression on a building or area, one example being Battle Fields. There are numerous accounts of people seeing soldiers fighting battles on old battle fields, only to learn later that day that there were no reenactments going on that day. 

By someone doing an action over and over in an area, they can leave an impression on the location also, Example being: when people hear footsteps walking down hallways yet no one is there, or when people see apparitions walking up/down staircases.

Another example of this is: In St. Augustine, Florida there's been a apparition of a woman who, every time seen, is always in the same location, and always doing the same thing.. Her laundry. As if she is stuck in time.