Mayan or not?

If we see time as a closed time loop to allow for time travel, then I need to find a distant past advanced civilization that will be able to give the characters in my book the coordinates in the fourth dimension (using a World time-line) of the transversable wormhole that has been previously used, thereby making it a plausible route back to the past. I'm thinking perhaps Mayan? Fascinating conundrum, which civilization to choose.