Even if you grab every last flag from Rome's four districts, you still won't have the complete set until you've found the 18 that are hiding in the city's Romulus Lairs. We can't point them out on a map, since the Lairs don't have them, but we can show you exactly where and how to find them. Let's get started.
Terme di Traiano: The Halls of Nero
After you dive from the first room into the hidden pool below, pan the camera around until you see this big stone urn-thing:
Head down the hallway toward the urn (which is your way out anyway), and hang a left. The lair's first flag is on top of another urn-thing at the end of the hallway.
After you make your way through the long room with the statues and the fire trap, you'll find yourself in this room, with the flag on the left. Go ahead and jump over to the rubble on the floor.
From there, jump onto the wall to your right and start climbing, then use the ledges to shimmy over to the left.
After the last step, you should be able to drop down onto the slanted, broken archway that dominates the far side of the room. Hop across the other side, climb up the wall and shimmy left for a clear path to the next flag.
When you enter the room with the bonfire, you may notice the flag on a pillar on the right side of the room. To get to it, though, you'll first need to go in the opposite direction.
Run up the wall above the throne and start shimmying left. Jumping from pillars to beams, you're going to make your way around the edge of the room (which you'd do anyway while playing through normally).
Eventually, your path will take you to the wall to the right of the throne. Climb up and to the right as far as you can, then look to the right and you should see a swing bar. Use it to leap across to the next platform.
From there, your path should be clear: just hop down to the beam, use the beam to get to the balcony, and use the balcony to reach the pillar. With that, all three of this lair's flags are yours.
Il Colosseo: Thrown to the Wolves
Look to your right when you enter this lair, and you'll see the first flag just out of reach behind a set of bars. Teasing you.
To reach it, you'll need to first climb up to the beam on the opposite side of the room. When it forks to the right and the left, turn left.
Jump off the edge of the left-pointing beam, and you'll grab onto a ledge above the flag. Drop down on the other side, and it's yours.
Another flag hiding in plain sight, you'll see this one among the jubilee celebrants. For now, just head up the stairs to the right of it, and hang a right when you reach the top.
After pushing past a small crowd of guys, you should see this on your left. When you do, drop down to ground level.
The next flag is in a semi-hidden room behind a couple of big red drapes. Just push past them and it's yours.
There's a right way and a wrong way to get to this flag during the end-of-level horse-chase sequence. As you can see in the video above, we went with the wrong way, which is to get off your horse when you see the flag, scramble up the wall to the right, and hop over to where the flag is before you run out of time. It'll de-synchronize you, but the checkpoint isn't far back, and you'll get to keep the flag.
The right way, meanwhile, is to jump off the horse's back at full gallop, bounce off the lower beam and grab the flag before dropping back down onto your still-running horse's saddle, as indicated below. It's tough, but it'll look really cool if you can pull it off.
Catacombe di Roma: Wolves Among the Dead
As you're working your way through the catacombs, you'll come across a fork in the road that looks like the image below. Take the path through the doorway on the left.
Follow it, and you'll soon reach a room with a ladder. Climb it, jump across the gap using the wooden platform, and head out onto the ledge beyond.
From there, you should be able to see the next flag, off to your left, although to get to it, you'll first have to go right.
Jump across to the next beam, then use the wooden platform to get to another beam. From there, the flag will be a few more jumps away, but within easy reach.
Further along, you'll enter a hall with this ring-covered wall on your right. The next flag is visible through a grate just above it.
For now, go straight past the rings, climb up to the platform in front of you and hop across the next gap.
As soon as the path divides, take a right. You may fall down a pit; just climb out and keep going.
After the pit, the path divides again. Take a right, and the next flag is just a short jog away.
When you enter the chapel near the end of the lair, you'll be able to see the next flag suspended high above you on a hanging platform. Getting to it is a little more complicated.
Head over to the other end of the chapel, and you should see this pile of beams and crates. Use it to climb up on top of that wooden structure.
From there, turn back toward the entrance wall and start working your way over to it, and then to the left once you've reached it.
Continue working your way across the entrance wall until you reach the platform at the opposite corner (pictured below):
From here, you could just leap straight forward to the next beam, but don't. Instead, run up the entrance wall to the next handhold, and jump off to grab this beam:
From here, there are just a few more beams and bars between you and the lair's last flag.
Next page: The final nine Secret Location flags in Palazzo Laterano: The Sixth Day, Cloaca Maxima: Leader of the Pack and Basilica di San Pietro: A Wolf in Sheep's Clothing!
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