|This article is about the memory. You may be looking for the location of the same name.|
Having located the last of Niccolò Polo's books, Ezio Auditore discovered that another one of the Masyaf Keys had been hidden underneath the Maiden's Tower. Ezio made his way to the tower and traversed the obstacles to obtain the Key.
Ezio retrieved the fourth Masyaf Key, with the only remaining key being in Templar hands.