Ravaldino's Secret: The entrance is sort of tucked away behind a tower on the other side of the city's water way to the west. Jump in the water and swim around the north end of the tower and you should find the entrance pretty easily. It's just off the water.
Swim to a platform across the water and use it to ramp up to a bigger landing. Wall run up the wall to the north and jump backward to continue across some beams and platforms to head south. For more info, watch the whole gameplay.
This is an Assassin's Creed II walkthrough for Tomb 4: Ravaldino's Secret.
Mahalo's Assassins Creed 2 Walkthroughs are more than enough information for you to play the game yourself, and they teach you everything your need to be prepared for when playing yourself. This video walkthrough focuses on Tomb 4: Ravaldino's Secret.
Assassin's Creed 2 by Ubisoft is the action-adventure video game playable on PlayStation 3, Xbox 360, Sony PSP, and Nintendo DS video game consoles, along with Microsoft Windows. It is the direct sequel of Assassin's Creed and revolves around Ezio, and is set in Renaissance Italy. Ezio befriends Leonardo da Vinci, who provides experimental weapons and gadgets, and takes on Florence's most powerful families and ventures throughout the canals of Venice, where he learns to become a master assassin. The Assassin's Creed 2 gameplay is a mixture of action, stealth, and acrobatics.