The Starfleet Museum was a museum with several facilities that housed starships important to the history of Starfleet.
In 2293, a terrorist group of humans calling itself 1992 stole the USS Yorktown from the museum and attempted to travel back in time to erase the events of the Eugenics Wars. The group, along with the Yorktown, disappeared. (ST reference: Federation: The First 150 Years)
Starbase 122 also featured part of the Starfleet Museum. The USS Enterprise-A was on display there in 2369. (TNG comic: "Old Debts") Every starship that bore the name USS Enterprise was also stationed and placed at the museum, honoring the famous Federation starships. (ENT episode: "These Are the Voyages...")
The Starfleet Museum had a facility on Epsilon Sigma V, which also boasted a great giftshop. The Planet Killer was one of many large exhibits at this "Trophy World" in 2380. (TNG novel: Before Dishonor)