A look at the role intelligence-collection ships played in all the major conflicts in the 20th century. In WWII, warships of many navies carried high-frequency direction-finding equipment and electronic intelligence-collection equipment.

During the 20th Century, the City of Berlin was a hotbed of espionage, first under Kaiser Wilhelm, then during Hitler's tyranny, and throughout the long Cold War. In the aftermath of WWII, Berlin became the focus of the intelligence war.

In a series uncovering 20th century spy stories, we examine U.S. air missions in Europe that supported the Office of Strategic Services, such as dropping off and picking up O.S.S. agents in German-occupied territory.

An unprepossessing Victorian mansion 50 miles north of London, Bletchley Park became Station X before World War II, and developed into the most potent deciphering center of WWII.

The fascinating story of 20th-century efforts to break down enemy signal security, to protect the sender's signals, and penetrate enemy secret communications.

Mata Hari, Sidney Reilly, Lawrence of Arabia, Cicero, Lonsdale, the Lucy Spy Ring...these are just a few of the colorful characters in our survey of the most daring and outrageous individual spy cases to have been publicized in the 20th Century.

The FBI serves as a national police force investigating interstate crime. However, it also handles violation of U.S. espionage laws by foreign agents. We'll probe this history, including the G-man era.

Created by President Harry Truman, the CIA became a global agency for collecting and evaluating intelligence through covert action. We tell its fascinating Cold War story, covering important areas of U.S. history.