The first excavations at Pompeii were undertaken by the survivors shortly after the destruction of the city. As the upper parts of the houses that had not fallen in projected above the surface, it was possible to locate the places under which objects of value were buried. Men dug down from the surface at certain points and tunnelled from room to room underneath, breaking through the intervening walls. This work was facilitated by the stratification of the volcanic deposit; the loose bits of pumice stone in the lower stratum were easily removed, while the stratum of dust above was compact enough to furnish a fairly safe roof for narrow passageways. Only infrequently is a house discovered that was left undisturbed; from this we understand why comparatively little household furniture of value has been found. Not only were rich house furnishings in demand,—the excavators carried away valuable building materials as well. So eagerly were these sought after that large buildings, as those about the Forum, were almost completely stripped of their marble.

In the Middle Ages Pompeii was quite forgotten. Possibly some remains of the ancient buildings were yet to be seen; at any rate it seems to have been believed that a city once existed there, for the site was called La Civita.

In the years 1594-1600 Domenico Fontana was bringing water from one of the springs of the Sarno to Torre Annunziata, and in the course of the work cut an underground channel through the site of Pompeii and discovered two inscriptions; but no further investigations were made. The indifference of Fontana may be explained by the fact that the water channel was not dug out from above, like a railway cutting, and then covered over, but was carried as a tunnel through the hill on which the city stood, so that the workmen came to the ancient surface at only a few points. In the part now excavated, the original level was disturbed in but one place, near the temple of Zeus Milichius; here the inscriptions were probably found.

The excavation of the buried Campanian towns began, not at Pompeii, but at Herculaneum, where in 1709 the workmen of the Austrian general, Count Elbeuf, sunk a shaft, reaching the ancient level at the rear of the stage of the theatre. The current statement that Elbeuf discovered the site of Herculaneum by accident, his workmen being engaged in digging a well, is erroneous. The location of the city was already known, and Elbeuf was searching for antiquities. The error probably originated in a misunderstanding of the Italian word pozzo, which has a double meaning, "shaft," and "well."

At first little was accomplished, but after 1738 excavations were carried on by King Charles III in a more systematic manner. The director of these excavations, Rocco Gioacchino de Alcubierre, in March, 1748, had occasion to inspect the water channel mentioned above, and learned that at the place called La Civita—which he thought was Stabiae—objects of antiquity were often found. He came to the conclusion that this site was more promising than that of Herculaneum, where the excavations just then were yielding little of value; the result of his recommendation was that on the thirtieth of the same month excavations were commenced at Pompeii, with twelve workmen.

The first digging was done north of Nola Street, near the Casa del Torello; then the men were set at work on the Street of Tombs, near the Herculaneum Gate; and a part of the Amphitheatre also was cleared. In 1750 the work was stopped, because the results were thought to be unimportant.

Attention was again directed to Pompeii in 1754, when workmen engaged in constructing the highway that runs just south of the city discovered a number of tombs. About the same time, west of the Amphitheatre, the extensive establishment of Julia Felix, arranged like a villa, and some buildings lying north of it, were excavated; but they were all covered up again, as was also the so-called villa of Cicero, which was uncovered in 1763.

The parts excavated were not left clear until after 1763, when the discovery of the inscription of Suedius Clemens, on the Street of Tombs, had established the fact that the site was that of Pompeii. Important discoveries were made soon after. In the years immediately following 1764 the theatres, with the adjacent buildings, and the Street of Tombs, together with the villa of Diomedes, were laid bare. The excavations were conducted slowly and without system, yet with scientific interest fostered by the Herculaneum Academy (Accademia ercolanese), which had been founded in 1755.

Under Joseph Bonaparte and Murat, 1806-15, the work received larger appropriations, and was prosecuted with greater energy, particularly in the quarter lying between the Herculaneum Gate and the Forum. In the same period the Forum was approached from the south side also. In 1799, at the time of the Parthenopean Republic, the French general Championnet had excavated, south of the Basilica, the two houses which are still called by his name. From these, in 1813, the excavators made their way into the Basilica, whence, in November of the same year, they pushed forward into the Forum. However, the excavation of the Forum itself with the surrounding buildings, prosecuted less vigorously and with limited means in the period of the Restoration, was not completed till 1825; by this time the temple of Fortuna and the Baths north of the Forum had also been uncovered. The following years, to 1832, brought to light the beautiful houses on the north side of Nola Street—the houses of Pansa, of the Tragic Poet, and of the Faun—and those on Mercury Street; later came excavations south of Nola Street and in various parts of the city.

The disturbances of the period of Revolution caused a cessation of work for two years, from July 3, 1848, to September 27, 1850. During the next nine years effort was expended chiefly in clearing Stabian Street and the Stabian Baths.