Château de Valle, Medieval castle in Follonica, Italy.

Château de Valle is a castle ruin situated on a hilltop north of Follonica, featuring a partially preserved tower with arrow slits and stone walls. The fortification displays construction elements that span different periods of its long occupation.

The complex arose in the late 9th century as a summer residence of the bishops of Lucca, then passed to the abbey of Sestinga. In the 12th century it went to the Aldobrandeschi, who sold it to the Pisans in the second half of the 13th century. It joined the Principality of Piombino in the 14th century and followed its fate until 1815, when the territory was annexed to the Grand Duchy of Tuscany.

The name Valle, also recorded as Valli, refers to the hill above Follonica's northern hinterland where the castle stands. The stone buildings around the ruined tower were largely rebuilt in neo-medieval style on the original structures, so visitors see a mix of genuine medieval masonry and later reconstruction.

The ruins are freely accessible and can be explored independently without requiring a guide or entrance fee. Visitors should wear sturdy footwear since the ground is uneven and parts of the structure may be unstable.

The stone buildings around the ruined tower are not medieval: they were rebuilt mainly in neo-medieval style on the remains of the original structures, so the walls of the tower keep the irregular filaretto masonry with its arrow slits while the surrounding houses show a later reconstruction.