A causeway built to end isolation was bombed for it

A road bridge finally lets cars reach Venice

You are standing on the bridge that made Venice reachable by wheel. Ponte della Libertà carries the road in across the lagoon from the mainland, a causeway that ends the old rule that everyone who came to this city came by water. Beneath your feet the road bed runs on fill and pilings driven into lagoon mud and, deeper still, submarine continental crust — the ground here was seabed long before it was ever a city's front door.

A railway version of this crossing came first, opened in the 1840s to link Venice to the Austrian mainland; the road bridge you are on followed roughly a century later, completed in 1933, doubling the causeway and finally letting cars, buses, and trucks reach Piazzale Roma, the square that still absorbs all of that traffic at the bridge's inner end. During the war the causeway was a target — rail links into Venice were struck from the air, and the twin ribbons of bridge you now stand between carried the risk twice over, once for trains, once for road traffic.

A short walk south of the bridge's landward end, the walls of Sant'Andrea della Zirada have stood since 1329, a church and monastery founded by four noblewomen on a spit of land the Venetians called "cao de zirada" — proof that this edge of the city, now dominated by asphalt and traffic islands, was already inhabited and named centuries before any bridge reached it at all.

Bombing raids target the only link to the mainland

The causeway you crossed to reach this point was struck more than once from the air during the Second World War, its rail line singled out precisely because it was the single thread tying Venice to the mainland — cut it and the city could be isolated. Bombing runs targeting the rail bridge risked the road bridge alongside it, the two structures running so close together that damage to one always threatened the other. No army ever forced its way across this water on foot; the war here was fought from above, against girders and embankment fill, and the causeway survived it, patched and rebuilt, still carrying the traffic it was built for.

Two streets in from the bridge's landward end, closer to Piazzale Roma, stands a memorial to the dead of the First World War 549 metres — a plainer, older grief than the bombing runs of the second conflict, but tied to the same ground: the names of men from this district who did not come home, fixed to a wall a short walk from where buses now idle. Nearby, a monument to Pietro Paleocapa 505 metres honours the engineer whose career shaped exactly this kind of infrastructure — canals, causeways, the reordering of water and land that made a bridge like this thinkable in the first place.

None of this asks for embellishment. A bridge built to end Venice's isolation became, within a decade of its completion, a wartime liability precisely because it had succeeded — because it was the one route worth cutting. That is the whole story of this stretch of asphalt: built to connect, then bombed for the same reason it was built.

Piazzale Roma absorbs all the traffic the bridge delivers

At the bridge's inner end, Piazzale Roma absorbs the traffic this causeway delivers, functioning now as Venice's only real bus terminus and one of just two points in the historic city reachable by car at all 409 metres. From there an elevated automated shuttle, the People Mover, carries passengers on to Tronchetto's car park 205 metres), a piece of transit infrastructure built to solve the exact problem the road bridge created: too many vehicles arriving at a city with nowhere further for them to go.

A short walk south, Sant'Andrea della Zirada keeps its 1475 Gothic rebuild and its older stone reliefs. Past it, the Ponte della Costituzione — Calatrava's contested glass-and-steel bridge, installed in 2008 amid public argument over its design and cost — offers a fourth crossing of the Grand Canal, a modern echo of the same impulse that built the causeway: connect what water divides 367 metres. Beyond that lies Venezia Santa Lucia station, terminus of the rail line that made the first crossing in the 1840s, and the Giardino Papadopoli, a shaded terraced garden squeezed between station and square. The Tolentini church and its rio sit close by too, another fragment of the parish life that filled this edge of the city long before engines arrived.

Old seabed still lies beneath every pier of the crossing

Beneath every pier and pontile of this crossing lies submerged continental crust, old seabed that never fully vanished, only sank and was built upon. Venice itself sits on a raft of timber piles driven into that soft ground, a city that argued its way onto a swamp and stayed. Following the Grand Canal north and east, Palazzo Labia, Palazzo Savorgnan, and the frescoed halls of other canal-side palazzi trace the wealth that once flowed through this water highway, while the church of San Geremia holds, improbably, the relics of Saint Lucy of Syracuse. Further along, the Cannaregio Canal and its three-arched bridge mark the old northern entrance to the city, used for centuries before the rail causeway made a swamp-bound approach into a mainland one.