Time Travel - Possible… or Not

Time Travel - Possible… or Not?

If time-traveling was possible in the future, why, through out the centuries, have we never met any time-travellers? Is it because they are too well-disguised or is our time period just not that interesting enough for them to visit? After all, our time period compared to Earth's long history is as boring as the rural area of Arizona. Considering the extreme cost of a time-traveling trip, our descendants probably will prefer the Jurassic or the golden age of ancient empires. Don't you think so?
And if you had a Doraemon's time machine, where and when would you like to go?

Let's just watch this video and reach your own conclusion.