Marzano Appio lies on the slopes of the Roccamonfina volcano, amid chestnut woods, and its territory holds a small lake of volcanic origin, the Lago delle Corree. The municipal coat of arms tells two things at once: the castle recalls the old fortress raised to defend the people of Terracorpo, while above appears the black cross of the Marzano, the family that held the fief for centuries. The fair of San Giacomo, held on the twenty-fifth and twenty-sixth of July, was instituted in 1299 by Charles of Anjou, king of Naples, and is still held, closing with flag-throwers in the streets of the village.
The most keenly felt feast, however, is that of Sant'Antonio, in the second half of August, and it ends with the Burning of the Bell Tower: a firework display that mimics the campanile of San Sebastiano going up in flames. In the hamlet of Grottola, where the town hall stands, the historic square was named in 2018 after Norma Di Sandro, the youngest victim of the sinking of the Andrea Doria, who died in a Boston hospital on the twenty-seventh of July 1956. Not far from her grave, in the cemetery of San Bernardino, stands a funerary chapel built in 1995 in white concrete, all niches and concave and convex surfaces, designed by the architect Ermanno Di Sandro.