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Time Portal
The Time Portal is a gateway to the past which appears in the Ziggurat Encampment in Act 3. It is activated after activating the Altar of the Sun in the Temple of Kopec.
The Time Portal takes you to a version of the Ziggurat Encampment with no NPCs or interactables, and the exit to The Drowned City replaced by an exit to Utzaal. No other area connections exist in the past
The Past
While completing Act 3, the time portal can be used freely to go back and forward between the present and the past. Portals created in past areas will go to the past Ziggurat Encampment, and from there the Time Portal can be used to get to the present Encampment to speak to NPCs or access the well or waypoint.
Areas set in the past:
Aftermath
After Act 3 normal is completed, the Time Portal becomes the entrance to Act 1 Cruel difficulty. After Act 3 cruel is completed, the Time Portal is deactivated and the waypoint is moved from the present version of the Encampment to the past.
In either case, you can access different versions of the town directly by travelling in from other connecting areas in the same time period, with The Drowned City (present) and Utzaal (past) being the easiest.