would you visit the past if you could

I would visit the past if I can, because if I do so, I can witness all the awesome historical events and record it. I can prove that the pyramids are not built by aliens and use a video recorder to record what actually happens. I can alos ask the Myans if they actually predicted the end of the world and what does it mean. I would also go back in time and just capture an tiny dinosaur and copy the DNAs of all the other bigger species, if things go well, we can even create a zoo full of animals. It would also be nice to just get a machine gun to mow down the charging persians in the battle of 300 and fight with the spartans with more advanced technologies. If i can, i will also murdur dictators like Hitler and Mao-Zedong when they are a child to prevent the atrocities that they will later conduct.