[1] Monte Mario Observatory (IAU code 034), the "historical" Observatory of Rome, located at 84 via del Parco Mellini in the northwest part of the city, atop Monte Mario, since 2002 is only the administrative seat of the Istituto Nazionale di Astrofisica (INAF).

In 1965, a new observing station was built in Campo Imperatore (2200 metres above sea level), on the Gran Sasso mountain.

OAR is responsible for the management of the “Museo Astronomico e Copernicano” (Astronomical Copernican Museum – MAC), in the ground floor of Villa Mellini.

MAC was established in 1873 by Arthur Wolynski, upon the basis of a Copernican collection, put together on the occasion of the fourth centenary of the birth of Copernicus.

Moreover, there is a rich collection of armillary spheres, as well as sky and earth globes, including Mercatore's and Cassini's.

Every year, a total number of 5.000 to 10.000 pupils (from kindergarten to primary and secondary schools) visit these labs with experienced guides.

OAR has organized three editions of “Cosmoscuola”, a series of Astronomy lessons and practical activities for children from 7 to 14 years of age.

Copper engravings especially made by many artists for the event Finally, OAR has organized, from 2012 to 2017, six editions of “Estate Sotto le Stelle” (Summer under the Styars), offering to the public a series of lectures, concerts, debates, exhibitions inside its “Parco Scientifico”.

OAR Researchers hold lections for both Bachelor and master's degree courses at the Physics departments of La Sapienza (4) and Roma Tre (1).

OAR takes part in the Doctorate in Astronomy, Astrophysics and Space Science which represents a consortium between la Sapienza and Tor Vergata Universities.

Human Resources OAR houses 40 researchers and technologists, 39 technicians, and administrative staff, all tenure track.