Villa Hadriana, western parts, near Tivoli, Italy. Entrance road between the Hundred Chambers to left and the Antinoeion at center.

The Hadrian's Villa (Villa Adriana in Italian) is a large Roman archaeological complex at Tivoli, Italy. It is a property of the Republic of Italy, and directed and run by the Polo Museale del Lazio since December 2014.
The villa was constructed at Tibur (modern-day Tivoli) as a retreat from Rome for Roman Emperor Hadrian during the second and third decades of the 2nd century AD. Hadrian was said to dislike the palace on the Palatine Hill in Rome, leading to the construction of the retreat. During the later years of his reign, he actually governed the empire from the villa. A large court therefore lived there permanently. The postal service kept it in contact with Rome 29 km (18 mi) away.

The "Cento Camerelle" (or "The Hundred Chambers") is the name given to a series of rooms probably used for storing supplies and housing slaves. Located along the western side of the Pecile terrace, it consisted of four stories of rooms accessible from concrete stairs that led to wooden balconies. Estimates of the number of rooms, which were paved in opus signinum, vary between 125 and 200. The lowest level included a latrine paved in opus spicatum. It led to a service corridor leading all the way to the Vestibule and the adjacent baths.

The so called Antinoeion is located just to the west of the access road leading to the Vestibule is a sacred precinct with two temples with white marble facing. The two temples faced one another across a plaza, in the middle of which is a base that probably supported an obelisk. Delimiting the precinct on the west was a colonnaded hemicycle with a central room. Date palms were planted in the open areas. A number of pieces of Egyptianizing sculpture were found here during the recent excavations. Other statues, found earlier in the general area, probably came from here as well, including the Antinous-Osiris (now in the Vatican Gregorian Egyptian Museum; inv. 22795) as well as the Harpocrates (Capitoline Museums, inv. MC646). The excavators, Z. Mari and S. Sgalambro, think the sanctuary was dedicated to Antinous, Hadrian's younger friend who died by drowning in the Nile in 130 CE. They speculate that the obelisk dedicated to Antinous, which now stands on the Pincian Hill in Rome, was originally erected on the base in the middle of the plaza.

more on https://en.wikipedia.org/wiki/Hadrian's_Villa , http://vwhl.clas.virginia.edu/villa/ , http://vwhl.clas.virginia.edu/villa/thehundredchambers.php and http://vwhl.clas.virginia.edu/villa/antinoeion.php

picture generously provided by Rudolf Kaufmann (2015)