sentences:  From 1613 onwards Giulio worked intensively as a civil engineer commissioned by the Grand Duke.Giulio worked on the Boboli Gardens, constructing the Grotto of Vulcan ("Grotticina di Vulcano", 1617) and laying out the second axis of the Boboli Gardens, at right angles to the first, with the bosquets on either side.Giulio constructed the Loggia del Grano in 1619, a Tuscan style loggia, and was thus amongst the first architects to employ the loggia in public buildings such as markets.