In the Pauline Hall of the Lower Galleries of the Vatican Museums the entire collection, consisting of nearly five hundred specimens, of micromosaics belonging to the pontifical patrimony has been permanently displayed. This extraordinary collection, once owned by Domenico Petochi, was acquired in the early 1990s thanks to the initiative of the then director Carlo Pietrangeli.

Some of the works were already presented to the public in the major 1986 exhibition hosted in the Braccio di Carlo Magno. Today, however, the entire collection is on permanent display: placed inside the ancient cabinets of the Vatican Library.