The following is based on Fallout 2 cut content and has not been confirmed by canon sources.
“You have encountered a monastery and a small community built around it.”— In-game description
The Abbey was a location for Fallout 2 that was eventually cut from the game. It was a monastery located north of Gecko, in which monks preserved technical knowledge in the form of books, blueprints and items. Interestingly, the monks did not actually understand the technical knowledge in the books they preserved in any practical sense. Instead, they treated them like holy materials; they were read, copied and cared for, but none of the knowledge was used as originally intended.
Although not a single preserved item at the Abbey functioned, it was open to anyone as long as they did not damage anything. This is very unlike the Brotherhood of Steel, for instance, who hoard knowledge and technology so that they remain superior to other factions.
The book A Canticle for Leibowitz by Walter M. Miller was the inspiration for the abbey. After a nuclear apocalypse remembered as the Fire Deluge, the monks in the abbey preserve the Ante-Diluvian world's knowledge, called the Memorabilia, by taking care of them as best as possible and recopying when necessary. None of them truly comprehend the contents of the books, but they hope that soon in the future will come an Integrator to synthesize the fragments of knowledge into a solid framework to rebuild upon.