The FBI has unveiled a searchable database called The Vault , that features dossiers of previously unseen files .

Featuring searchable dossiers on characters as wide-ranging as Al Capone, Marilyn Monroe, Notorious B.I.G. and the 9/11 hijackers, the FBI has upgraded its online public records to provide more than 2,000 digitized documents.

Some of the documents released under Freedom of Information Act requests include a detailed chronology of the hijackers' movements prior to Sept. 11, 2001, including their ATM withdrawals, cell phone activity and training flights taken in Florida, New Jersey and elsewhere.

A chronology of events -- the "Hijackers Timeline" -- is a 150-page spreadsheet detailing the terrorists and their associates. Beginning with Mohamed Atta, who crashed American Airlines Flight 11 into the North Tower of the World Trade Center, the document lists each subject's country of origin, date of birth and tracks every known movement they made leading up to the attacks.

Users of the FBI's new system can also search through topics like counterterrorism, the "Gangster Era," and Popular Culture, where they'll find the FBI's file on subjects like Osama Bin Laden, George "Machine Gun" Kelly and Malcolm X, respectively.

Other topics that can be found in the FBI's database include the Patriot Act, which reduced restrictions on law enforcement agencies' ability to search communication records; the Mexican Mafia; and alleged UFO sightings in Roswell, New Mexico.

One document, for example, pertains to Guy Hottel, a special agent in charge of the FBI's Washington Field Office, who sent a memo concerning flying saucers to the FBI's director in March 1950.

Read more: http://vault.fbi.gov/