The Cuckoo's Nest

 is a location in the southwest of the Big Empty.

Layout
The entire cave appears to be a lobotomite den and is littered with corpses and piles of flesh. There are several hostile lobotomites within the cave including the unique lobotomite, Test Subject 1.

Notable Loot

 * The Sink Project: Toaster holotape can be found to the right immediately upon entrance on the bottom of a shelf on a makeshift shrine.
 * The protonic inversal axe is on the body of Test Subject 1.

Appearances
The Cuckoo's Nest appears only in the Fallout: New Vegas add-on, Old World Blues.

Behind the scenes
This is most likely a reference to the 1962 novel One Flew Over the Cuckoo's Nest, which featured an asylum where lobotomies were performed to keep patients docile.