You proceed forward.
After a short while, you reach the gate. The neighborhood here is fairly bad... cheap apartments, mostly. It is notable that the ones nearer to the gate are, in addition to being low-cost housing, are emergency fortifications in case the gate falls... they form a sort of ring around the gate, with narrow alleyways between them (except for the main road, but materials are present to allow a few people to quickly construct a barricade across it). A cursory inspection reveals such defensive features as arrowslits and murder holes... they've definitely put at least SOME thought into this construction. Unfortunately, being made of wood, they won't stand up to a serious attack... a few Orcs with torches could burn the lot of it, assuming they got past the inevitable swarm of archers.
The gate itself is a large wooden monster, reinforced with iron at the bottom to ward off torches and the like. It is open, at the moment... allowing a rather limited movement of goods in and out. The guards note your white armbands, and wave you through with a call of "Good luck!"
Outside the gates, you see a once-grand portion of the city, now not far above ruins. Directly ahead, you see a crumbling edifice that seems to be the old center of government... various desecrated monuments encircle it, as well as a number of other old government halls. A great many poor-looking people (even poorer then the residents of the gate disistrict, by the look of things!) move between buildings... all these old buildings are clearly inhabited. Some have even reopened old shops, and begun selling various goods. They seem happy to see you... the presence of such a large and well-armed militia force must be comforting, to those living in such a dangerous area. To the north, Red Keep is clearly visible... it seems to be constructed of a reddish stone, making it quite literally red. It is clearly in disrepair, and the red stone that gave it it's name has faded, but it is certainly the place you are looking for.