I am rather sorry but I don't really think the last few questions really qualify as Trivia per sé but that's just my humble.
We know (or at least i do )
I apologize for the inconvenience

A: According to Doctor Tot, Gargan Roo is an ancient travel route between Treno and Alexandria.

I was thinking about something else but i think that was already inside the Alexandria Castle

Q: What key items can you find in Alexandria? (all trips)