My kids love to go and play in the creek near our house. They always find treasures when they are there. People used to dump their garbage in the creek or on the banks, so sometimes their findings are treasures! They've brought home many glass jars, glass bottles, a child's metal sewing machine, metal tractors, other toys, china, etc.
This weekend, they brought home a Borden's milk bottle, another bottle that I need to research and a toy cow.