The Cuckoo's Nest

 is a location in the southwest of the Big Empty in the Fallout: New Vegas add-on Old World Blues.

Layout
The entire cave appears to be a Lobotomite den and is litered 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
This location 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 Cucko's Nest, which featured an asylum where lobotomies were performed to keep patients docile.