Vasco da Gama Bridge

The Vasco da Gama bridge opened in March 1998, weeks before Expo 98, to take through traffic off the 25 de Abril bridge and to link Lisbon directly to the southern bank at its widest point. It runs 17.2 kilometres in total - mostly low viaduct across shallow water and mudflat, with a cable-stayed main span of 420 metres carried on H-shaped pylons 155 metres high - and it was the longest bridge in Europe from completion until 2018. It is built with a curve and a slight gradient, so drivers cannot see the whole length at once, and the deck is designed to withstand an earthquake substantially stronger than 1755. The environmental constraint was the Tejo estuary reserve beneath it, one of Europe's most important wetlands, which shaped the piling and construction methods. It is best seen from the Parque das Nações waterfront.

What you actually see

• The length - 17.2 kilometres, mostly viaduct over shallow estuary water.
• The cable-stayed span - a 420-metre main span on 155-metre pylons.
• The seismic design - built to withstand a quake stronger than 1755.
• The estuary - the Tejo reserve wetland the bridge crosses.

When to go

Year-round. Twenty minutes to drive across; an hour to view from the Parque das Nações waterfront, best at sunset. Tolled in both directions.

Honest expectations

There is no pedestrian or cycle access - it can only be driven, and the toll applies. Drivers see little of the structure because of the curve. Fog closes it occasionally. Viewing is from the Lisbon bank rather than on it.

Nearby

Parque das Nações and the Oceanário are at the Lisbon end; Alcochete and the estuary reserve are across.