We cannot time travel. Period.

Imagine though if we could. Travel back to the beginning of creation and see God at work. Travel to the end of time and see His return.

Or if you don't believe in God, you could still zip around and see our beginning chicken/egg predicament and our eventual demise.
I'm sure the universe is littered with civilizations like ours with entire planets floating around in space lying in ruin from an ELE. Such tragedy without hope.
Or even traveling to the end of our universe into nothingness. Imagine... nothing existing?