Berlin's favorite avenue for strolling is called "Unter Den Linden." German tour guides tell us how the tree-lined boulevard also reveals a lot of important moments in their country's history. In London, we'll hear how low tide on the River Thames, often brings pieces of that city's past to the surface. And an artist with a passion for public street art tells us how she helped to brighten up a couple of working class neighborhoods in Rio de Janiero.
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