Hi, you can map whatever you want: any historical objects and also existing objects, since they exist since a certain time. Of course there are different "strategies": Some people focus on certain objects (there used to be a project to map the major roman roads), some people focus on the complete history of one place including today's objects etc. The tagging system is indeed identical with OSM. A time slider is still missing, but as I heard, it is in development. Please remember to add start_date (and end_date) tags, even if you don't know exact dates (see https://wiki.openstreetmap.org/wiki/Open_Historical_Map#Tagging). The time slider will retrieve these tags.
Best regards, Paul
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