The origin of Celso is linked to the figure of some families from Pollica who, to escape the infighting of their country, took refuge higher up the hill: it still retains the ancient urban structure, which makes it a particularly characteristic place, especially in the districts of San Biase and Valle. Many houses are adorned with defensive towers, placed to guard massive carriage doors, which allow the passage of only one person at a time.
Among the places of historical interest there is the Mazziotti Baronial Palace, now a national monument. Matteo Mazziotti was born here, a distinguished scholar of the Cilento Risorgimento and a parliamentarian in the post-war period.
The Church of Celso is dedicated to Our Lady of the Assumption. Built in local stone and decorated with terracotta frames, it has a very low bell tower compared to the architectural complex, built in the eighteenth century.
The small church of San Giovanni, built in the early 1500s, stands on the rural road towards Casal Velino. It belongs to the nucleus of the ancient village of Praganito, a village abandoned in the 12th century.
The splendid Convent of Constantinople was built in the 15th century. by some refugees from Constantinople who, having fled from Mohammed II, wanted to build a place of worship dedicated to the Madonna. In 1610, Antonio Griso, lord of the place, entrusted the chapel to the Augustinian friars who founded a convent there, suppressed after about a decade for lack of resources.