Swiss architect Peter Zumthor— himself considered a bit of a enigma in a world that lauds celebrity designers—built the tiny Bruder Klaus Field Chapel in western Germany in 2007. The structure was created by arranging 112 spruce trees, pouring concrete on top until it set, then burning the wood, leaving a charred interior cavity.  Photo 1 of 21 in You Won't Believe That These Incredible Modern Buildings are Chapels and Synagogues