Started a generation ago by Abraham Washington's parents, the museum in Rivet City is dedicated to the preservation of historical knowledge about the United States of America and holds various artifacts related to the once mighty nation. [Non-game 1] The project is now curated by Abraham, and he expands the collection with the aid of mercenaries and scavengers. 
The Preservation Society houses many important documents from history including the Constitution of the United States, the Emancipation Proclamation and a copy of the Gettysburg Address. Additionally, there is an intact P-51 Mustang suspended from the ceiling. Despite being the current curator, interactions with Abraham showcase confusion and mottled details of American history, which is then passed on to visitors of the Preservation Society.
The entrance to the museum leads to a walkway above the room, which has two staircases leading to the main floor. The museum is contained inside a large chamber on the midship deck, with a smaller room adjacent to it acting as Washington's private quarters. The centerpiece of the room is the large fighter suspended from the ceiling, with salvaged neo-classicist columns and other historical artifacts surrounding it. The proudest collection of memorabilia is displayed on the southern wall, where Washington's collection of historical documents is displayed in glass cases.
- * Optionally after Stealing Independence
The Preservation Society's name is inconsistently referred to as both the Capitol and Capital Preservation Society. Signage around Rivet City uses the Capitol spelling, while Abraham Washington and the "Welcome to the Capital Preservation Society" terminal both use the Capital spelling.
The Capitol Preservation Society appears only in Fallout 3.
Behind the scenes
- The airplane attached to the ceiling of the Preservation Society is an exact representation of the P-51 Mustang fighter.
- The posters that are on the walls here are also some of the loading screens.
- Rivet City terminal entries; Abraham Washington's terminal
- The Lone Wanderer: "Is the museum looking to acquire anything else?"
Abraham Washington: "Well, yes. Any document of historical significance would be of benefit to the Society. However, I am also interested in branching out. Perhaps some interesting artifacts related to our great country's history. Be sure and bring me anything you find along those lines. I'd be happy to compensate you once again."
(Abraham Washington's dialogue)
- Abraham Washington: "Pleased to meet you. Abraham Washington's the name. I am curator of the Capital Preservation Society. If you have time, come take a look at our exhibits. Now, if you'll excuse me..."
(Abraham Washington's dialogue)
- Fallout 3 Official Game Guide Game of the Year Edition p.59: "Abraham Washington
Washington, 45, continues the work started by his parents, who were just as passionate about preserving their heritage as residents of the nation's capital. He's a virtual shut-in at his Capitol Preservation Society. Abraham is one of those classic social outcasts who talks to himself all the time. He has almost no social skills and has a deeper emotional connection to his historical objects than he does to any human being. He requests that you help him locate some documents in Miscellaneous Quest: Stealing Independence."
(Fallout 3 Official Game Guide Game of the Year Edition Wasteland Census)