Ancient Trees in Bilbao
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The Plane Trees of Jardines de Albia
London Plane (Platanus x acerifolia). over a century. Free, open public square in central Bilbao, accessible at all times

The Bald Cypress of Deusto
Bald Cypress (Taxodium distichum). not documented. Free. Stands at the entrance forecourt of the University of Deusto's main (1886) building, on the public avenue facing the Guggenheim across the river; the building itself is a working university, but the entrance grounds where the tree stands are open to the public.

The Centenary Trees of Parque de la Misericordia
Canary Island Date Palm (Phoenix canariensis). over a century. Free during the day; the park is walled and gated shut at night, per bilbaovisitavirtual.eus.

The Centenary Horse Chestnut of Parque de Doña Casilda
Horse Chestnut (Aesculus hippocastanum). over a century. Free, open public park, Bilbao's largest and most central, accessible at all times.