This is fun one: the Vizcaya Bridge (Bizkaiko Zubia; Puente de Vizcaya) links the towns of Portugalete and Getxo, just upriver from Bilbao, across the mouth of the Estuary of Bilbao (the last stretch of the Nervión-Ibaizabal River before it enters the Atlantic).
Built in 1893 by Albert Palacios, one of Gustave Eiffel’s students, it solved the problem of facilitating traffic between the two cities at the mouth of the estuary (which otherwise required backtracking into Bilbao). A gondola shuttles every 8 minutes back and forth, suspended from the track that hangs between two 45m tall towers, carrying passengers, cars, and cargo.
It was inscribed on the UNESCO World Heritage list in the industrial heritage category (in which is it the only Spanish entrant) in 2006.
