the bell tower of the sanctuary of SS. Crocifisso and partly excavated by the University of Macerata in the 1980s, can be considered as an Egyptian sanctuary for Isis and Serapis. The discovery of a marble head of Serapis and a number of smaller Egyptian statuettes, as well as the second century AD inscription that mentions the temple of the “Domina” (the goddess Isis), can lead to the interpretation that this foreign cult was practiced here. Main sights Religious buildings Treia Cathedral (SS. Annunziata): medieval brick Duomo Santuario del SS. Crocefisso: a large early 20th‑century church complex San Filippo Neri: Baroque church Santa Chiara: late-Baroque/early-Neoclassic church San Michele San Francesco San Lorenzo Santa Maria del Suffragio Monastero della Visitazione Secular buildings Palazzo Municipale: 17th‑century Town Hall (includes a collection of Renaissance and classical paintings that may be visited on request Villa Spada or Villa "La Quiete": work of the neoclassical architect Giuseppe Valadier (now in ruins) Museum of the town's history, inaugurated in 2004. Georgic Academy Archaeological Museum Municipal Theatre References Marengo, S. (2000), Regio V Picenum – Trea. Supplementa Italica, Nuova Serie 18, Roma, Casa Foscari, pp. 155–188. Paci, G. (1999), Indagini recenti e nuove conoscenze sulle città romane del territorio marchigiano. Annali della Facoltà di Lettere e Filosofia, Università di macerate, pp. 201–244. Percossi Serenelli, E., Pignocchi, G. and Vermeulen, F. (eds.) (2006), I siti archeologici della Vallata del Potenza. Conoscenze e tutela, Ancona, Ministero per i Beni e le Attività Culturali. Direzione Regionale per i Beni Culturali e Paesaggistici delle Marche. Vermeulen, F., Slapšak, B., Mlekuž, D. (2012), Surveying the Townscape of Roman Trea (Picenum). In: Johnson, P.S., Millett, M. (eds.), Archaeological Survey and the City, University of Cambridge Museum of Classical Archaeology Monographs, Cambridge, pp. 261–282. External links Official Site of Treia Istituto Paladini Bill Thayer's site General Department of the Marches Ghent University - Potenza Valley Survey Project (Text originally based on Bill Thayer's webpage, by permission.) Hilltowns in the Marche