Porta Castiglione was a portal of the former outer medieval walls of the city of Bologna, Italy.
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First erected in the second half of the 13th century, and rebuilt in the 15th century. The now isolated tower once was a machiocolated rampart in the city walls. The gate once stood beside the Savena Canal, which crossed the city and whose current fed hydraulic power to the city's cloth factories.[1] 44°29′08″N 11°20′54″E / 44.48556°N 11.34833°E