The Palau Guell was designed by Gaudi for Eusebi Guell and his family. Located in the Gothic quarter of the city, Palau Guell has a parabolic arch facade and mosaic figures on the roof. The interior has a parabolic dome in the central hall and a lounge ceiling perforated by circles to let light in. At night, lanterns were hung from the ceiling to give the appearance of a night sky. On top, there are colorful tree-like chimneys.
The residence which once entertained the crème de la crème of Barcelona society, is today a UNESCO world heritage site.