The museum displays about 1,000 artefacts, including the ice-climbing axe used in the assassination of the Russian revolutionary Leon Trotsky; a section of Francis Gary Powers’ U2 spy plane shot down over the Soviet Union in 1960; the handcuffs used to arrest John Anthony Walker Jr, a former Navy chief warrant officer convicted of spying for the Soviet Union from 1968 to 1985; and a large piece of a tunnel that penetrated East Germany so that the US and its allies could tap Soviet and East German communications