Berlin nurtures a true bike culture. Bikes weave around cars, whirl down sidewalks, and lean against every building. Clusters of bikes are chained to every available post, sign, and handrail. These humble vehicles are a quintessential part of life in Berlin. Because they're so embedded in the lifestyle, they reflect a lot about the city and its citizens. Chipped paint, baskets, and even the chains used to secure the bikes speak of the people and the...