Basilica di San Marco
The Basilica di San Marco is a large cathedral church located in the San Marco district of Venice. Constructed in the Byzantine style in 1071 AD, it lies on the Piazza San Marco, adjacent to and connected to the Palazzo Ducale; the Doges of Venice regarded it as their private chapel. As a consequence of its opulent design, gilded Byzantine mosaics, and its status as a symbol of Venetian wealth and power, from the 11th century on the building was known by the nickname Chiesa d'Oro (Church of Gold).
At some point in its history, the Basilica became home to one of six Assassin's Tombs that protects Amunet's Seal. Once you enter the Basilica via the skull-switch, Ezio attempts to pull four levers that are situated at the ceilings of the four halls of the inside. Each lever rotates a circular shape of the mural in the center of the basilica that, once all levers have been pulled, forms the Assassin insignia that causes the mural to retract onto the floor revealing Amunet's Tomb. St Mark's Bascilica is a restricted area in game and is surrounded by many guards.