Just a quick 15 minute walk away from Checkpoint Charlie...
is the Spy Museum Berlin:
No place would be better-suited for a spectacular tribute to the
protagonists of this international gloom of espionage than Potsdamer
Platz in the centre of Berlin – the Capital of Spies. There, in 2015,
the German Spy Museum Berlin opened in a 3.000 m² (32.000 sq ft)
The museum features exhibits on the history of espionage from Roman times to the Cold War to the Present Day. It's a great museum and even features an interactive "laser maze" to test your flexibility and Mission Impossible skills.