Porta Castiglione, City gate in Bologna, Italy

Porta Castiglione is a gate of Bologna's third circle of walls, built in 1250 entirely of brick. It stands isolated at the junction of Via Castiglione and the ring boulevards, and its present look results from an 1850 restoration and the early-20th-century demolition of the walls. The Savena Canal once entered the city beside it.

Porta Castiglione was built in 1250 as part of Bologna's 13th-century third wall circuit, entirely in brick. It lost its keep in 1378 and was reworked until 1403, then heavily restored in 1850; the walls were dismantled in the early 20th century. Further restoration followed between 2007 and 2009.

Bolognese call it pôrta ed Stra Castión, and the gate stands where Via Castiglione meets the ring boulevards. Beside it the Savena Canal entered the city, its current driving the cloth factories' hydraulic power. The gate was deactivated and reactivated several times over the centuries.

The gate is located near several historical buildings and green spaces, making it a good starting point for exploring the eastern district. Visitors should explore on foot and take time to look closely at the structure and its surroundings.

The tower of Porta Castiglione once stood beside the Savena Canal, which provided water power for Bologna's textile manufacturing. This waterway was crucial to the economic development of the region and connected the gate to the city's industrial activity.