Bolsena is a small town on the northeastern shore of Lago di Bolsena, the largest volcanic lake in Europe. The lake itself is the main attraction — clean, calm water surrounded by green hills, with two small islands visible from the shore. Swimming and boating are popular in summer, and the lake's volcanic soil supports an eel population that turns up in local cuisine.
The town has a medieval centre clustered around the Rocca Monaldeschi, a thirteenth-century castle that now houses a small museum of local archaeology and lake ecology. The Basilica of Santa Cristina is where, according to Catholic tradition, the Miracle of Bolsena occurred in 1263 — a Eucharistic miracle that prompted Pope Urban IV to institute the Feast of Corpus Domini.
The wider area around the lake is rich in Etruscan history. Tombs and remains are scattered through the surrounding countryside, and the nearby towns of Orvieto, Civita di Bagnoregio, and Viterbo are all within easy day-trip range. The geological curiosity of the Pietre Lanciate — columns of basalt thrown up by ancient volcanic activity — lies a short distance south of town.