Castagno: I, the old chestnut, symbolize the hidden virtue, the one you have to seek because it isn’t evident. In fact you have to know how to recognize my sweet and nourishing fruits under the thorny and repellent peel. In the wonderful panorama of the Prati Piani, hidden from the city by steep paths and leafy woods, there is a centuries-old chestnut tree waiting for you. The next test is engraved on its trunk