Castiglione del Lago is a town in the province of Perugia of Umbria (central Italy), on the southwest corner of Lake Trasimeno.

The newest parts of the city are at some distance from the old, so the centro storico (historical center) of Castiglione del Lago is a well-preserved medieval locality that seems to be governed by a "law of threes".

Its position in this hotly disputed territory, pitting Etruscans against Romans, and later Tuscans against Perugians, inevitably brought a long cycle of death and destruction to the town.

The monumental ancient Roman "Gioiella-Vaiano" villa[3] (between the villages of Gioiella and Vaiano) was excavated in 2016-9 and was a large complex for both pleasure (otium) and production (negotium).

The nymphaeum was designed to impress visitors with the control and display of water, of a standard found in the most luxurious villas on the Bay of Naples.

It was built around a large vaulted space over a pool with 12 niches in the walls decorated with blue glass to reflect the water below and to imitate a grotto.

Since 2005, however, this festival has been held annually and now includes light aircraft (nearly 2000 in 2007), hot air balloons (17) and thousands of multi coloured kites.