Probably home to an ancient pre-historic castellar, if not of a proper castle, to which it owes its name, Castello is an outstanding panoramic location set on top of a rocky hillock, offering a magnificent view over higher Val di Sole and the Presanella and Brenta ranges.
The toponym, that - according to a local tradition - would recall the presence of an ancient castle or fortification, appears in a document dated 1210. During the 14th and 15th Centuries, many feudal lords were invested with tithes at Castello. During the 16th Century the village was part of the so-called “sindacato dei monti” along with Cellentino, Termenago and Ortisè. This was one of the seven entities comprised in the Ossana Parish church. In the Middel Ages as well as in modern times the village was a self-ruling community following the rules of the Carta di Regola (doc. 1308 and 1430). In 1537 the chapel was turned into an independent curacy and used to lead the small churches of nearby hamlets. Between 1810 and 1819 the village was merged into the Termenago municipality, to become independent until 1929, when it became part of the Ossana municipality, whereas in 1954 it joined Pellizzano.
The church dedicated to Saint Donatus, rising on a hillock overlooking the village, dates back to the 15th Century. The building is the work of the Lombard craftsmen who used to do a lot of work in the valley at the time. The aisle-less interior is covered by a ribbed vault of gothic style.
The façade portal – with a lintel and a lunette on top with a frescoed Pietà (16th Century) – is in a Renaissance style. The embattled bell tower has a square design. Some wooden altars include canvasses dating back to the 18th and 19th Centuries.