Guggenheim Bilbao: It took only 4 years to build this amazing structure

The Guggenheim Bilbao is one of the most admired architectural designs of this century

Guggenheim Bilbao: Design was made possible by use of Catia, a 3D design computer program

Guggenheim Bilbao: The Guggenheim's exterior is covered in glass, titanium and limestone.

'Maman' a sculpture by Louise Bourgeois

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Guggenheim Bilbao was intended to look like a ship

Titanium is rarely used for buildings so the Guggenheim Bilbao is unusual

Guggenheim Bilbao: The random curves are designed to catch the light

The Iberdrola tower, the Guggenheim and Maman

The Guggenheim tower, the Red Arches and the Guggenheim Bilbao set against Mt Artxanda

Puente de la Salve's bright red arches

The Red Arches on Puente de la Salve

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'Maman' the bronze cast spider