The Biblioteca Angelica is a public library located in Rome, Italy. In front of the Piazza Sant'Agostino square, adjacent to the church of Sant'Agostino, not far from Piazza Navona.
The library holds about 180,000 volumes of manuscripts and 1,100 incunabula, which formerly belonged to the Augustinians. These works are important for our knowledge of the history of the Reformation and Counter-Reformation.
Wikipedia https://en.wikipedia.org/wiki/Biblioteca_Angelica
Coordinates 41°54'2.198" N 12°28'28.044" E