When it opened in 1997, the Frank Gehry-designed Guggenheim Museum Bilbao—a spectacular structure made of titanium, glass, and limestone—was hailed as the most important building of its time. Located in the Basque city of Bilbao in northern Spain, the museum features exhibitions organized by the Guggenheim Foundation and by the Guggenheim Museum Bilbao, as well as selections from the permanent collection of the Guggenheim Museums.