Porta San Donato
Also known as Porta Zamboni, this 13th-century gate was the main entrance to Bologna's University Quarter from Ferrara, and originally had a drawbridge and house for guards. Its location at the intersection of the city's main ring road and Via San Donato has long made it a target of road engineers, but it has survived with its tower and was recently restored. It's also the terminus for several bus lines into the hinterland.
Piazza Porta San Donato