Another short-ish challenge, the Berlin Wall. From the site, "The Berlin Wall takes you on a powerful 30mi (48km) journey through the center of Berlin, Germany, from Waltersdorfer Chaussee to Hermsdorf. What used to be a symbol of a world split in half by the Cold War now is the symbol of freedom, liberty, and unity."
Here's a map from Wiki of the wall back then, showing checkpoints. Key: Solid line: the Berlin Wall Dotted line: edges of East Berlin Blue dots: Checkpoints open to Germans only Red dots: Checkpoints open to Germans and non-Germans.
The thriving city of Berlin is home to 3.8 million people. It is the capital city of Germany, the largest city in the country and one of the most populated in Europe. A tourist destination, Berlin is rich with culture, diverse architecture, vibrant nightlife, a plethora of festivities and a very high quality of life.
Yet not so long-ago, Berlin was a decimated city, a result of heavy bombing during WWII. When Germany lost the war in 1945, the country was divided by the Allies into four sectors. The Allies consisted of the United States, Great Britain, France and the Soviet Union (USSR). East Germany was occupied by the USSR and West Germany was split between the other three. Berlin, as the capital city, was located in East Germany and it too was carved up into East and West Berlin.