If I had a Time Machine

Having thought about the famous People I would like to meet. It made me think, "if only I had a Time Machine", what famous person would I like to meet, and what historical event would I want to witness?

1. I would like to meet Leonardo Da Vinci, to tell him to make a glider instead of the man powered Ornithoper.
2. Next The Wright Brothers flight at Kittyhawk.
3. Check out the claim that Clemet Adler flew his steam powered airplane the Eole in 1890.
4. The beginning of the Universe.
5. Maybe try to stop Hitler and Al-Qaida from gaining power.

This is why I would like to meet Theroretical Physics like Stephen Hawking or Albert Einstein, to ask them if we could travel into the future. This would be important because, if you couldn't travel into the future (because it hasn't happen yet) you would be stuck in the time you had traveled too.

What are your thoughts on time travel, and what historical event would you want to witness?