The only way time travel could work is if the traveler had been completely removed from existence, and was only an observer looking in. Peering through a window, fast forwarding and rewinding time at will but forever separate from causality.
If you could go everywhere, see everything–but interact with nothing… would it be worth it to satisfy your curiosity? Could you give up all effect on the world in order to know all its secrets?
Maybe the subject of my next story/novel/cluster of words…