Tunnel
In Assassin's Creed: Brotherhood, Niccolò Machiavelli introduces Ezio Auditore to a tunnel network that passes underneath Rome, which he can use to quickly travel to several points in the city, and avoid the notice of any guards. The tunnel entrances may be used or travelled to, as long as they have been repaired or renovated.
The tunnels, which are the equivalent of the fast-travel stations in Assassin's Creed II, have the letters SPQR engraved over the entrance. When selecting the area in Rome where the player wants Ezio to go to, there is a brief cutscene of Ezio opening the latch on the gate and entering, though the player is not able to see or travel through the tunnels themselves.
The tunnels lead to places such as Tiber Island hideout, the Colosseum, and the Rosa in Fiore, among other landmarks.DAFT PUNK RULES!!!!!!!!!!