About 33,000 titanium panels cover much of the Guggenheim Museum Bilbao’s exterior.
The panels form the museum’s shimmering, irregular skin, designed by architect Frank Gehry. Their thin, slightly curved surfaces catch changing daylight and often appear silver, gold, or blue-gray depending on the weather and viewing angle.
The titanium was selected partly because it is lightweight and resistant to corrosion. Bilbao’s climate is rainy and humid, so ordinary untreated steel would have been less suitable for the building’s expressive exterior.
The panels are only one part of the museum’s material palette. Limestone and glass are also prominent, while the building’s curving forms surround galleries, atriums, and public spaces. The titanium cladding became one of the visual features most associated with the museum after its opening in 1997.