The Berlin Wall created two separate cities, two sides competing to be the best. And one of their biggest points of pride? Their zoos.

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On March 21, 1960, U.S. Vice Admiral Hyman Rickover discusses the importance of keeping abreast of Soviet technological developments.

For 30 years, the Berlin Wall was the defining symbol of the Cold War, separating families and keeping the people from jobs and opportunity in the west.

On the evening of November 9, 1989, East Germany announced an easing of travel restrictions to the west, and thousands demanded passage through the Berlin Wall. Faced with a growing demonstration, East German border guards allowed citizens to cross. CBS News is on the scene as scores of East Germans climb on top of the once-imprisoning wall.

If humans disappeared tomorrow, what would happen in the animal kingdom? This video clip looks at the effects of human absence on animal population and speculates about the Darwinian battle that would result if humans were suddenly removed from the ecosystem.

On June 12, 1987, in a speech delivered from the Brandenburg Gate in West Germany, President Ronald Reagan makes one of his most famous statements when he calls on Mikhail Gorbachev to tear down the Berlin Wall.

In November 1958, Soviet Premier Nikita Khrushchev demanded that Western forces pull out of West Berlin in six months. On March 16, 1959, in a radio and television report to the American people, President Eisenhower speaks of the escalating Cold War tensions over Berlin, stressing that the United States will not give in to pressure from the USSR.