Fairy World Jail
It resembles a real dungeon. However, it also has an interrogation room. It appears in School's Out!: The Musical where Jorgen Von Strangle detain Cosmo and Wanda because they grant Timmy's wish, which was to allow kids can rule the world, earlier in the episode. According to Da Rules, fairies can only be assigned to children in need and in his musical Pull Back the Fairies, according to the title itself, he pulled back the fairies because the kids now rule the world. This is also where Cosmo and Wanda sang their love song, Floating With You to distract Jorgen for them to escape and help Timmy foil the evil plan of the Pixies.
Fairy World Maximum Security Prison
We get introduced to the Fairy World Maximum Security Prison where Anti-Cosmo is being held there for his crimes. In this episode, Cosmo needs a Fagiggly Gland transplant and can only get it from his Anti-Fairy counterpart who is being held there.
Fairy World Prison
The Fairy World Prison is another prison that appeared in When Nerds Collide!.
It's unknown if this is a replacement for the maximum security prison that appeared in The Gland Plan, or possibly a lower level prison for less dangerous prisoners. However, this might raise questions of why Anti-Wanda is held here when she was previously held in the maximum security prison.
Abracatraz is Fairy World's maximum security prison where the most dangerous prisoners are kept. It is known as Jorgen's prison stronghold. Anti-Fairy baby, Foop, was kept there, along with many other Anti Fairies. It is a parody of the real world jail, Alcatraz.