The Inner City is the grouping of buildings surrounding the central tower of an Ancient city-ship, Atlantis. During a dream Dr. Kate Heightmeyer fell off the central tower into the inner city and died not only in the dream but also in real life. Michael Kenmore also died in this manner, but this time he fell in reality. (SGA: "Doppelganger", "The Prodigal")

The inner city of Atlantis houses such areas as:

Other city ships have the same structural layout but different rooms may have different functions.

(SGA: "The Siege, Part 2", "This Mortal Coil", "First Contact")