The origins of its name are connected to its foundation in the early 11th century, when the Castro Vallis Maiors was built, a Byzantine fortified village, sentinel of the wide Valle Maggiore, where the Celone torrent flows. Of the original center remains the testimony of the Civic Tower that constituted a strategic point of observation of the passages on the near Via Traiana, then Francigena of the South, from the mountains and passes.
Today Castelluccio is a village with slow rhythms and medieval suggestions, consisting of alleys and arches, fountains and public wash houses, churches and palaces. Among its most striking monuments are the churches of Santa Maria delle Grazie, San Rocco and San Giovanni Battista.
The viewpoints that characterize the boundary of the village introduce to the many green and wooded areas of its territory. Just outside the village in the direction of Faeto is the Ponte del Freddo and the Petrera Pinewood, from which hiking trails of easy practicability start; more challenging are the Path Frassati di Puglia and the sheep track that leads to the top of Mount Silone.