Visit the courtyard of the Wehrmacht HQ, where coup and assassination plots against Hitler backfired disastrously. See where the SS masterminded their first program of mass murder, the "euthanasia project". Explore the outwardly grand "Stalin Allee", showcase of post-war East Germany's communists, but scene of festering discontent in 1953.

Find out about "Operation Gold", a top secret CIA/MI6 spy tunnel, and how a British double agent blew the whistle on the whole operation. On Bernauer Strasse, see where Berliners attempted audacious escapes under the Wall, trying to keep one step ahead of the hated East German secret police, the Stasi.

The tour finishes at the infamous Stasi HQ, office of Markus Wolf, "the man without a face" and model for John Le Carre's spymaster "Karla". Explore the museum at the end of the tour; the spectre of Stasi informers and their controllers will haunt your very footsteps!