Think of MS Flight Simulator or Google Street View as documenting the current world. Then take the same approach to thoroughly document the past. The locations, the events, all in 3D VR with realistic graphics, and simulated actors that react to events and react to the players.
Take the current knowledge and physical/archaeological remains of the past, and digitise them, digitally renovate them. Do this rigorously and professionally. Not Hollywood-style approximation, but the work of real historians and archaeologists. Let historians use it and debate the details how it should really look, or how the events really unfolded and adjust it accordingly. Organise the database of content and simulations. AI is possibly already there to automate processing and conversion to 3D of old videos, photos and paintings, even perhaps writings to animation scripts. If not yet, some AI researcher is surely working on that.
Make a VR meta world, where players can travel to certain locations and certain time and interactively take part in the events.
I would pay a monthly subscription for such a thing, to see the past getting recreated digitally. It would be the next best thing we actually could do, compared to real time travel.