If you could time travel w/o changing history or being harmed, where and when in time do you most want to go?

I would have liked to go back to the times just before the end of WW 2 and ask the soldiers who were to drop the atomic bombs if they had any inclinations that they would be killing a lot of people especially women and children and enter us in an age where our security would always be compromised by the threat of nuclear annihilation . But also that their actions would enter us into the Nuclear Age