Gravity Falls Maximum Security Prison

Gravity Falls Maximum Security Prison is a penitentiary where Gideon Gleeful resides as an inmate. It is also where he hosts his show, "Li'l Gideon's Big House!" on Gravity Falls Public Access TV.

History
The prison was first seen in "Dreamscaperers" as it flashed on Bill Cipher's body while he was demonstrating to Gideon how he knows many things.

In "TV Shorts 1," the penitentiary is actually seen. It is also revealed to be the location of Gideon Gleeful's incarceration. Gideon hosts a tv show, "Li'l Gideon's Big House!" from here.

In "Scary-oke," the prison is seen again, this time shown from the inside as the light from the portal shined through a barred window, awakening Gideon.