Proceeding from north to south, the ruins may be divided, for the convenience of description, into ten grand groups--A, the Palæstra, including the Greek and Latin Theatres and the Nymphæum; B, the Pœcile; C, the Guards’ Barracks; D, the Library; E, the Imperial Palace; F, the Stadium; G, the Thermæ; H, the Canopus; I, the Academy, including the third theatre or Odeum; K, the Inferi. In giving these general divisions, some attempt is made to represent the parts of the villa as they were in Hadrian’s time. The ruins are in such different states of preservation--some being entirely destroyed and the ground-plan barely traceable, while others are almost entire--that their real relative importance is completely obscured. The modern alleys and walks also create much confusion, and render the recognition of the ancient arrangement much more difficult. The ancient grand entrance to the grounds was at the north-western end of the ruins, on the road towards Tibur, about a quarter of a mile beyond the Ponte Lucano. It seems to have consisted of two large pedestals of white marble, between which the carriage-road passed, and which were pierced with arched passages for the footways on each side. One of these is still traceable in the Vigna Gentili, and has the remains of a bas-relief upon it, while the other has been destroyed, and its corresponding bas-relief placed in the Villa Albani at Rome. This gateway has been imitated by the architect of the gateway at the old Villa Borghese. It is erroneously called a tomb by Piranesi and Ligorio (see Piranesi, Ant. Rom. tom. ii. tav. 39.) The modern entrance to the ruins is at the gate of the Villa Braschi, and leads, through an avenue of cypress-trees, in a direction at right angles to the ancient road of approach. The avenue runs across a space which was formerly a large quadrilateral court, 350 feet by 250 feet, surrounded with porticoes, attached to the theatre which stands a little to the side at the end of the avenue. The ancient road from the Ponte Lucano entered this court at the northern angle. The porticoes have now nearly disappeared, but part of them was remaining in Ligorio’s time. They served the same purposes as the great colonnades behind the Theatres of Pompey and Balbus at Rome. The theatre is an oval building, sunk in the slope of the rising ground, the southern side containing the seats for spectators, and the northern being occupied by the orchestra and scena, which has a stage in the form of a long and narrow parallelogram. The plan corresponds exactly to the description by Vitruvius of a Greek theatre, and has, therefore, been called the Greek Theatre by the antiquaries. The Greeks had the orchestra wider and the actual stage much narrower than the Latins. Fragments of the travertine substructions of the scena still remain.