After completing the nearby Adventure Lab History Marks the Spot Part 1, you will receive the coordinates for the location of this bonus cache.
This cache represents a bit more "modern" history. In 2011, a building that was on the lot next to this location collapsed one night into a sinkhole. The sinkhole was supposedly caused by a drainage project that was taking place down the street. At the location of the bonus cache once stood a City Hall building. It sat between the locations of the collapsed building and the drainage project. Due to cracks appearing in the building walls, City Hall services were relocated across town and the building was eventually demolished.
Photo credit: Post and Courier, 1/17/13