The Four Books of Architecture offers a compendium of Palladio's art and of the ancient Roman structures that inspired him. The First Book is devoted to building materials and techniques and the five orders of Tuscan, Doric, Ionic, Corinthian, and Composite. Palladio indicates the characteristic features of each order and supplies illustrations of various architectural details. The Second Book deals with private houses and mansions, almost all of Palladio's own design. Shown and described are many of his villas in and near Venice and Vicenza (including the famous Villa Capra, or "The Rotunda," the Thiene Palace, and the Valmarana Palace). Each plate gives a front view drawing of the building and the general floor plan. The Third Book is concerned with streets, bridges, piazzas, and basilicas, most of which are of ancient Roman origin. In the Fourth Book, Palladio reproduces the designs of a number of ancient Roman temples. Plates 51 to 60 are plans and architectural sketches of the Pantheon.