For the Tel Uvirith location there is "Building Up Uvirith's Grave" (and another one called "Building Up Uvirith's Legacy"), which turns that sorry tower into a fully functioning city. This includes silt strider transportation, an inn, a building for every playable faction, additional guards if you're a member of the legion, a city wall, and even an egg mine (your choice of using slaves or paid labor). I can't remember if you need to build the entire city first, but this also includes a throne room at the top of the tower, which has the pleasant surprise of a ring that instantly teleports you there.