The great Petaluma Mill, built in 1854, was one of California's largest feed mills. Petaluma was known as the World's Egg Basket in the early 1900's mainly because of the large number of layer chicken farms throughout the area. Also were quite a few dairy farms in the fertile valley. Today, the mill, Petaluma's oldest structure, has been transformed into a structure housing over 20 specialty shops and restaurants. Relics and antique photographs tell the story of milling in the Petaluma Valley.