If you have an ounce of impatience in you, you will learn exactly nothing from them. But if you become indifferent to trying to get anything to happen, and just decide to sit on a rock, lean on a rock, put your hand on a rock and be at peace . . . oh my.
You will hear truth. It may or may not come to you in words, but it registers as truth. Rocks are the great preservers of that which is ancient. If you want to step back in time, visit an ancient site that was built of stone. Try to be there away from distractions of other people, if possible, and listen. Listen hard and listen deep. It is the best time machine ever.
When I visited Karnak Temple in Egypt, I was, as are all who come, so lifted up by the scale of things, and the beauty and grandeur of the place. But even more than appreciating the visual, I wanted to LISTEN and to listen with no one around. I did not get to do that but I knew if I had been able to, I would have learned much.
Rocks are not dumb. They are not ignorant. They are conscious and aware but at a vibratory rate that most people are not able to easily match. To commune with any consciousness, we must be able to get on the same wave length. For some reason, speed of thought has been made god so conversing with rocks is not a popular pursuit. But still and all . . . if time travel interests you, may I recommend getting 'stoned' in the best of ways, by listening to the wisdom keepers.