When the Red Army tanks rolled into Berlin in May 1945, an incident commemorated by the Soviet war memorial on Strasse des 17 Juni, it should have signaled an era of peace, instead it was just the opening chapter in a new era of repression and division for the city of Berlin.
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The Potsdam Conference split the city into four sectors to be administered by the Americans, British, French, and Soviets as a symbol of peace and unity. The ideal would not last long, as suspicion soon set in between the Soviets and the western allies, and Berlin became the front line of the Cold War. The city was effectively divided in two in June 1948 when the Americans, British, and French established a joint administration for their sectors with a single currency; the Soviets immediately responded by blockading the city. West Berlin was kept going by an American and British airlift. During that time, everything the city needed, including a power station, had to be flown in. International pressure caused the Soviets to drop the blockade after 11 months, but worse was to follow.

On the night of August 13th, 1961, in the space of 6 hours, 155km of barbed wire went up, sealing off West Berlin to its East German cousin and dividing friends and families for the next 28 years. This wire soon developed into a wall, a wall that became the greatest symbol of east-west rivalry. Parts of the wall survive to this day, including a number of pieces around Potsdamer Platz, including some fine murals and a guard tower, and a lengthy section outside the Topography of Terror exhibition on Niederkirchnerstrasse. Also worth looking out for is the Communist entertainment complex Palace of the Republic on the site of the old royal palace on Unter den Linden. Currently closed for the removal of asbestos, this palace included cafés, bars, a cinema, a bowling alley, and, the ultimate in mindless entertainment, the East German government.

The history of the Soviet repression is commemorated at Haus am Checkpoint Charlie (open 9am to 10pm, daily entrance €7 ($9.01)). Outside is a reconstruction of the famous border crossing point on its original location, inside is a collection of photographs, documents, films, and artifacts relating to escape attempts (the building itself was used as a lookout post for escape helpers), the art of (and on) the wall, the worldwide struggle for human rights, and the wall itself. The museum was established in 1962 and can seem a bit outdated in places, but it is still well worth a look.

The regime effectively ended on November 9, 1989, when, during a live televised press conference, Politburo member Gunter Schabowski started adlibbing and accidentally announced the immediate end to travel restrictions (oops!). The entire population of East Berlin took to the streets, overwhelming the surprised border guards and throwing open the gates.