This talk provides a brief overview of our efforts to reconstruct virtually the late-medieval village of Northeye in the coastal salt marshes of the Pevensey Levels in East Sussex, England. I'll demonstrate how we used ArcGIS Pro and ArcGIS online to synthesize documentary evidence, hidden maps, historic maps, and remote sensing data to model the thirteenth- and fourteenth-century flood mitigation efforts around Northeye, and how the resulting HGIS is being used to generate a pedagogical video game styled after classic Tower Defense games.