Royal Chapel of the Treasure of San Gennaro

The Royal Chapel of the Treasure of St. Januarius, or the Reale cappella del Tesoro di San Gennaro, is a chapel located in the Cathedral of Naples, Italy, and dedicated to St. Januarius, patron saint of the city. This is the most lavishly decorated chapel in the cathedral, and contains contributions by the premier Baroque artists in Naples.

Source: Wikipedia