Program 666: Unter den Linden; Touring the Thames; A Heart for Public Art

A pair of German tour guides take us on a vicarious stroll down Unter den Linden, the famed tree-lined boulevard running through the heart of Berlin, and describe what it reveals about their country's history. A British writer and avid "mudlarker" explains why low tide on the River Thames often brings pieces of that city's past to the surface. And an artist with a passion for street art tells us how she helped brighten up a couple of working-class neighborhoods in Rio de Janeiro.

• German tour guides Fabian Rueger and Holger Zimmer
• Lara Maiklem, author of "Mudlark: In Search of London's Past Along the River Thames" (Liveright)
• Nicolina Johnson, aka "Nicolina," artist and founder of The Free Art Society in New York City

• Unter Den Linden is an historic boulevard in the center of Berlin.
• Tour guide Holger Zimmer provides custom tours in Berlin, Dresden, Leipzig, and Potsdam, and contributes arts and culture features for RBB kulturradio in Berlin. 
• Fabian Rueger has developed the Packupine app to help with packing suitcases while traveling, as well as a color puzzle game called Wunderbunt.
• Lara Maiklem is the author of "Mudlark: In Search of London's Past Along the River Thames" and "A Field Guide to Larking."
• Lara recommends the Thames Discovery Programme for guided low tide walks along the Thames.  
• Nicolina's website includes photos from her flutuarte project painting fishing boats in Rio de Janiero, and from her Hearts of the World and Free Art Society adventures.