I dreamt that I was a kid again, traveling with my parents and my sister. After an overnight trip, it used to feel nostalgic to come back home, dropping off the nearest station and walking towards the house. These days are long gone and my parents are getting old. If I could go back to my child days even for a brief moment, I would pay a substantial amount of money.
There is a lot of money to be made out of a time machine. Pity it cannot be built so easily. There are some arguments about whether it is in principle possible at all, including the famous paper by Kurt Goedel. Personally I would bet on its being impossible. If the general theory of relativity predicts that it is possible, then probably there is some flaw in Einstein's model of the Universe.
I accept that time machines are not possible, and I satisfy myself with being nostalgic for the nostalgy I felt as I was coming back home hand in hand with my parents when I was a kid. It is terrible that time never flows backward. Maybe it is a blessing as well.