Finding this one isn't too hard; just head into the building, turn around and look above the entrance with Eagle Vision activated.
To get up there, you'll want to climb up the wall decorations on the left of the images above, then shimmy around the ridge above until you're close enough to simply climb into the Cluster entrance.
Head around to the back of the Palazzo Senatorio with Eagle Vision activated, and you'll quickly see where the next Cluster is hiding. To get there, though, you'll need to climb up the Palazzo's back wall until you're about halfway across the width of the building.
To enter the Cluster, you'll need to hop up to the beam pictured above and shimmy along the roof until you're right above it. Then drop, holding B or Circle to ensure that you grab the Cluster's ledge as you fall.
The next Cluster's just west of Santa Maria dei Miracoli (the one on the left). You'll find it on the north face of the tower near the church's dome.
To access this one, just hop over and grab the nearest handhold. You should then be able to climb normally through the gap.
If you're standing in the right spot, you can kind of see the Cluster on the courtesans' headquarters when you're standing on the street out front.
Get over to the north side of the building and start climbing; the Cluster's just under the northwestern corner of La Rosa's roof.
Next page: Cluster locations in the Antico and Vaticano districts!
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