Since 2009, Little Free Libraries have grown from one in the front yard of a house in Wisconsin to over 25,000 little libraries in over 80 countries.
Todd Bol, from Hudson, built the first one six years ago as a memorial to his mother. Today, their popularity has soared far beyond the borders of Wisconsin. There are Little Free Libraries around the world.
"I don't think that people sometimes realize that these Little Free Libraries are in India, they're in Iceland, they're in Australia, they're in Pakistan. And its really become a global movement that has started right here in our backward," says Minnesota writer Margret Aldrich.
A new book by Aldrich seeks to capture what makes the phenomenon so popular. The Little Free Library Book features pictures of some of the most interesting ones, and directions for building your own.