The brick and opus reticulatum facing of the walls is especially fine.
Pietro e Paolo and the adjoining houses are extensive substructures (in opus reticulatum and brickwork) of the 1st century A.D., belonging to a building erected by M.
Sepolcro, a circular church with ornamentation in brick and an imitation of opus reticulatum, should probably be attributed to the 6th or 7th centuries.
The ruins consist of an amphitheatre (now almost entirely demolished, but better preserved in the 18th century), a theatre, and a very fine aqueduct in opus reticulatum, the quoins of which are of various colours arranged in patterns to produce a decorative effect.
North-east, close to the village of Atripalda, and consist of remains of city walls and an amphitheatre in opus reticulatum, i.e.
At Baiae itself there exist three large and lofty domed buildings, two octagonal, one circular, and all circular in the interior, of opus reticulatum and brick, which, though popularly called temples, are remains of baths or nymphaea.
In the neighbourhood are the remains of several ancient villas, and along the Via Appia still stands an ancient wall of opus reticulatum, with an inscription, in large letters, of one Varronianus, the letters being at intervals of 25 ft.
Below it, on the cliffs above the Anio, is a large building round a colonnaded courtyard in opus reticulatum built over the Via Tiburtina (which passes under it in an arched passage), generally known as the villa of Maecenas, but shown by the discovery of inscriptions to have been in reality the meeting place of the Herculanei Augustales, connected probably with the temple.
About the only indigenous fruit-bearing plants are the Chilean strawberry (Fragaria chilensis) and the ohelo berry (Vaccinium reticulatum), both of which grow at high elevations on Hawaii and Maui.
Remains of the walls of the lower town, of the cella of a temple built of blocks of peperino, and also of later buildings in brickwork and opus reticulatum, connected with the post-station (Aricia being the first important station out of Rome, cf.
The "quasi-reticulate" period - walling faced with masonry not yet quite so regular as opus reticulatum, and with brick quoins, coinciding with the second period of decoration (the architectural, partly imitating marble like the first style, but without relief, and by colour only, and partly making use of architectural designs).
No homogeneous series of buildings - we find various styles of construction (quasi-reticulate, opus reticulatum of tufa with stone quoins, of the time of Augustus, opus reticulatum with brick quoins or with mingled stone and brick quoins, a little later); and three styles of wall decoration fall within its limits.
Remains of the ancient theatre and of the city walls exist in the modern village, and above it is an area surrounded by a portico, in opus reticulatum, upon the north side of which is a rectangular building in opus quadratum, probably connected with the temple of Juno.
The medieval castle of the Frangipani, in which Conradin of Swabia vainly sought refuge after the battle of Tagliacozza in 1268, is built upon the foundations of a very large villa, of opus reticulatum with later additions in brickwork, and with a small harbour attached to it on the south-east.