Time traveler on Orient Express

If you had a time machine what would you do?
Where would you go?
Of all the miracles and events that happened in history, what would you most like to see with your own eyes?
What if things weren't the way you thought they should be?
Would you try to change something?
What if your well-intentioned attempt would cause a greater tragedy than it was without you doing anything? A group of unusual people got a unique opportunity to see it for themselves, but something was not right.
It seems as if someone or something, some higher power got involved in their adventure, directing them in a direction in which they did not want to go. In the end, they ended up in a place they thought should never be there, witnessing something that changed the character of all the existence.