Torre Glòries (Agbar Tower)

Jean Nouvel's bullet-shaped tower in Poblenou — Torre Glòries, formerly the Agbar Tower — clad in a shimmering, perforated skin that shifts color and glows at night. By day its bullet silhouette is a striking punctuation mark on the skyline; after dark the illuminated facade becomes the real spectacle, cycling through blues and reds. Inspired, Nouvel said, by Montserrat's peaks and by geysers of water, it has become one of the defining images of the city's modern, eastern districts. For architecture enthusiasts, the night lighting is the moment to catch it.