The divided city of Berlin wasa hotbed of spying activity throughout the Cold War, with one famous operation involving atunnel being built by the British and US into Communist East Berlin to enablecommunications cables to be tapped.
Russia's KGB knew about the tunnel thanks to the treachery of George Blake, but did not take action against it in order to protect their mole in British intelligence.
In the 1950s, the US National Security Agency (NSA) used Berlin's highest hill, the Teufelsberg, as a listening station.
The site was frequently used by American soldiers and its five large satellite domes on top of the building, though unused, can still be seen today.
More top news
Tory Chief Whip Michael Gove has taken time out from his schedule to claim second place in Westminster's Dog of the Year competition.
An airline safety video features orcs in oxygen masks, elves for flight attendants and epic battlefield scenes.
TV presenters Richard Madeley and Judy Finnigan say they have made a formal complaint after their daughter received rape threats.