Capital City Prison

The Capital City Prison or Prison Tower is a large, fortified stone tower located inside a hollow volcanic crater near the capital. It is here where the Fire Nation keeps its most highly prioritized criminals. As shown in "The Headband", Iroh is one of the few prisoners being held within the penitentiary, until he managed to break himself out as seen in The Day of Black Sun, Part 2: The Eclipse.

After the failed invasion of the Fire Nation on the Day of Black Sun, the prison was used to house most of the captured invaders.

After Fire Lord Ozai was defeated by Aang he is incarcerated there.