Below are several resources that you may find of interest in studying intelligence history.

Bletchley Park is the home of British codebreaking and a birthplace of modern information technology. It produced secret intelligence that had a profound influence on the outcome of World War II. Bletchley Park is an internationally renowned site, visited by people from around the world. It celebrates the values of the people who worked there: broad-minded patriotism, commitment, discipline, and technological excellence.

National security lawyer Mark Zaid and his colleague Bradley Moss are representing four plaintiffs in a Freedom of Information Act lawsuit against the Central Intelligence Agency.  The plaintiffs are former CIA officer Jeffrey Scudder, Dr. Kenneth Osgood, and two members of the NASIH board: Dr. Hugh Wilford and Dr. Mark Stout.  The suit is intended to oblige the CIA to release nearly four hundred in-house histories.  The lawsuit also challenges the Agency’s practice of refusing of providing electronic copies of declassified records.

The Crypto Museum is a virtual museum, with a permanent collection displayed at exhibitions in Europe and abroad. Aiming to preserve cryptologic history through collecting and restoring historical cipher machines, the museum has Enigma machines, spy radio sets, and many other cipher technologies.

The Government Communications Headquarters (GCHQ) website includes historical notes for nearly 100 years of cryptologic history, providing substantial value for intelligence scholars.

The International Spy Museum is the only public museum in the U.S. solely dedicated to espionage and the only one in the world with a global perspective on an all-but-invisible profession that has shaped history. The museum features the world's largest collection of international espionage artifacts, many never-before seen by the public. These artifacts help bring to life the strategies and techniques of the men and women behind some of the world's most secretive espionage missions.

This museum is the National Security Agency (NSA)'s principal gateway to the public. Situated next to NSA Headquarters, the museum hosts thousands of artifacts relating to the history of the cryptologic profession and the people who have devoted their lives to it. Originally intended for employees to reflect on past cryptologic successes and failures, the museum opened to the public in 1993.

Founded in 1985 by journalists and scholars to check rising government secrecy, this archive represents the leading non-profit user of the U.S. Freedom of Information Act, combining: investigative journalism, research on international affairs, archives of declassified U.S. documents (dubbed "the world's largest nongovernmental collection" by the Los Angeles Times), a public interest law firm defending and expanding public access to government information, and global advocacy for open government.

SpyCast's weekly podcast, produced by the International Spy Museum, features discussions with a wide variety of experts on intelligence topics, including interviews with former practitioners and scholars.

Spybrary is a podcast for fans of espionage books and movies.

The Spies and Shadows podcast covers the United Kingdom's covert intelligence world.

The Wilson Center's digital archive provides researchers with access to formerly-classified documents from around the world. The contents range from diplomatic correspondence to meeting minutes and many other types of historical documents. The Digital Archive's stated goal is "to deepen and enrich international scholarship, history education, and public policy debate on important global issues and challenges."

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