Plans to build a €100 million satellite of the Guggenheim Bilbao in Spain’s protected Urdaibai biosphere reserve have been abandoned after nearly two decades of legal challenges and escalating local opposition. The museum’s board of trustees — which includes the Basque regional government, the Biscay provincial council, and the Solomon R. Guggenheim Foundation — voted this week to halt the project, citing insufficient public support and scientific objections. 

Conceived as a two-site expansion aimed at revitalizing the struggling Busturialdea region, the project would have placed new cultural facilities in a refurbished factory in Gernika and on the former shipyards at Murueta, linked by a “green path.” Environmental groups argued that adding up to 140,000 visitors annually would cause irreversible damage to the wetlands, which provide essential habitat for migratory bird species including the sea eagle, spoonbill, and Eurasian bittern. Opponents also noted that Spanish law requires the Murueta shipyards to be dismantled when their industrial concession expires, preventing permanent redevelopment. 

The decision marks the most consequential shift for the institution since the Fr...