The next one's on a rooftop overlooking a large courtyard with a well, near the Campagna/Centro border.
The next flag is nestled out of view on this rooftop, just across from the Mercato di Traiano.
On a low rooftop in the French military outpost.
At the edge of a cliffside courtyard, just north across the water from the Borgia Tower that Bartolomeo sends you to destroy.
Walk or swim around to the north shore of the Borgia Tower's island. The next flag will be in plain sight.
This one's literally impossible to miss; it's at the top of the Borgia Tower that your first mission with Bartolomeo and his mercenaries will lead you straight to. Go ahead and snag it, or simply destroy the Borgia Tower to grab it automatically.
You'll find this one hiding on the roof of a church right next to an underground entrance. Just climb up that scaffolding on the left...
... and the next flag will be in plain view behind the steeple.
The last flag in the southwestern area of Campagna is hiding on the lip of another acqueduct. Climb up past the waterfall to grab it.
Campagna Flags 19-26
You won't be able to access this next set of flags until later in the game; once the area's open, though, they're not that hard to spot. Begin with this one, on a wooden ledge jutting out from a Borgia/Assassin tower:
The next one's just northeast of where Flag 19 was, on a short tower overlooking this not-so-busy street.
You'll find your next flag on this cool series of freestanding archways, just a little southwest of the marker for the Terme di Diocleziano.
Northwest of the Terme, and just a little southwest of the nearby Romulus Lair, you'll find your next flag atop - what else? - a platform held aloft by ruined columns.
Look for the next flag on top of a small tower near a blacksmith's shop.
At the fortlike French defenses just outside Castra Praetoria, you'll see a short, squarish guardhouse next to the gate. Climb up on top of it...
... and the next flag is yours for the taking.
The next flag is just a little east of the last one, to the right of the real gate into Castra Praetoria. To grab this one, climb up the scaffolding next to the other side of the gate, and then swing across.
The final flag for the Campagna region is atop Castra Praetoria's inner keep, on the roof above its southwestern edge..
Campagna Feathers 1-3
Your first feather is easy to find; after Ezio gets healed during his first mission in Rome, head west to the little church near the border with Centro. The feather's near the northwestern edge of its roof.
The next feather in Campagna is right on top of the barracks where Bartolomeo lives; just climb up to its tallest tower...
... and you'll find the feather hidden behind the battlements.
After you've gained access to the eastern section of Campagna, the district's final feather can be found sitting out in plain sight at the Terme di Diocleziano.
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