The sprawling metropolis of Philadelphia is a historic center filled with many of America's first and oldest sites. So, it may surprise visitors to learn that one of the country's best botanical gems is hiding in plain sight in the Philadelphia metropolitan area. One that has seeded hundreds of trees to become America's oldest "food forest." More than a century of flourishing fruit and nut trees sprawling over dozens of acres, now tucked in private gardens and standing on public streets. The best way to visit this food forest is on a trip to Downingtown, Pennsylvania.