you have to do the cristina memorie where leanardo da vinci tells you cristina is in town
Currently, you can't. I'd imagine it would become available if Ubisoft decided to release another DLC package, though.
go to the quick travel stations
No. You are actually in the Auditore Villa.
Monteriggioni
it just goes into it when u steal
It's in the Northern part of the walled city of Monterigionni.
It is located In Monteriggioni. Just go near the Villa and you will see the crypt.
Leonardo Da Vinci appears when you find a new codex page. Near the beginning, he is in Florence. He laters leaves and head to Venice. Near the end of the game, he is at your villa.
Very simple, you get after leaving Florence (not for good) but It isn't that far into the game. Hope there are no spoils in there! :)
He begins in Florence, then moves to Venice later in the story. At the end, in memory sequence 14 he can be found in Montigerionni. (The Villa)
Take them to the assassins tomb. It is located right behind Mario's office in the villa.
Enter your villa from the front door, and immediately turn left and go through the doorway.
find all asassins tombs go in get the seals and go under the villa auditore and it is there
it is the condottiero hammer. you unlock it when you have put 50 feathers in the chest in maria's room in the Villa Auditore