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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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.

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 June of 1987, President Ronald Reagan stopped in West Berlin on the 750th anniversary of the city and delivered one of his most famous lines when he demanded that Mikhail Gorbachev tear down the Berlin Wall. In an address to the nation following his return from that trip, President Reagan recalls standing next to the imposing structure.

On October 22, 1962, in a national statement, President John F. Kennedy discloses that U.S. spy planes discovered the placement of Soviet offensive missiles in Cuba.

West German Foreign Minister Hans-Dietrich Genscher traveled to the U.S. to meet with President George H.W. Bush the day after the November 20, 1989, fall of the Berlin Wall. In his public remarks, Genscher pledges to encourage democratic reform.