OpenHistoricalMapStart and end #dates are very important for a #HistoricalGIS project. We managed to stuff dates into more of the website’s nooks and crannies, so you always know which stage of a boundary or building’s evolution you’re looking at, or whether it’s even the one you’re looking for.
To go along with this change, the time slider now remembers the last date and date range you set, so if you’re only interested in #AncientHistory or #prehistory, you won’t be constantly reminded that 1825 was #200YearsAgo.