The de Young Museum in San Francisco, designed by Herzog & de Meuron and Fong & Chan, is the most visited art museum west of the Mississippi, attracting 1.2 million visitors annually. The design features a striking copper-clad exterior and well-lit interior spaces aimed at enhancing the visitor experience with natural light, but it faces environmental criticism due to copper runoff pollution. Despite its impressive architecture, concerns regarding sustainability and structural challenges have arisen, highlighting a dichotomy between its aesthetic appeal and ecological impact.