The Largest Mirror In The World, Salt Field, Bolivia

Due to its location in a steep-sided valley, the Italian town of Viganella gets no direct sunlight for seven weeks each winter. In 2006 a €100,000 computer-controlled mirror, 8×5 m, was installed to reflect sunlight into the town's piazza. In early 2007 the similarly situated village of Bondo, Switzerland, was considering applying this solution as well. Mirrors can be used to produce enhanced lighting effects in greenhouses or conservatories.
Leisure