Assassin's Creed II/Assassin's tombs

There are 6 Lairs, spread across Italy, all of which, upon completion, reward you with a Seal, which can be used to unlock Altair's Armour. All the tomb missions are optional except Novella's Secret which is used to progress the story (Sequence 4).

Novella's Secret

 * Location: Florence
 * Reward: 1,250ƒ, Seal of Darius

Il Duomo's Secret

 * Location: Florence, Basilica Santa Maria del Fiore (North End)
 * Reward: 1,250ƒ, Seal of Iltani

Torre Grossa's Secret

 * Location: Tuscany, Torre Grossa
 * Reward: 1,250ƒ, Seal of Wei Yu

Ravaldino's Secret

 * Location: Forli
 * Reward: 1,250ƒ, Seal of Qulan

Visitazone's Secret

 * Location: Venice
 * Reward: 1,250ƒ, Seal of Leonius

San Marco's Secret

 * Location: Venice
 * Reward: 1,250ƒ, Seal of Amunet