The transporter bridge linking Las Arenas (Getxo) and Portugalete, declared a heritage monument by the UNESCO World Heritage Committee, is more than 125 years old. Designed by the architect, Alberto Palacio, a disciple of Gustave Eiffel, it was opened in 1893.
Vehicles and foot passengers are transported in a gondola, suspended from a rail by 36 wheels and measuring 25 metres long, which travels along the rails of the horizontal crossbar. The gondola operates 24 hours a day. The walkway is open from 10:00 until sunset.
http://www.bilbaoturismo.net/BilbaoTurismo/en/puente-colgante