This central artery up through Gràcia would be a lovely stroll if the automobile and (worse) motorcycle din weren't so overpowering. (A tunnel would do the trick nicely.) However, many of the buildings along Gran de Gràcia are of great artistic and architectural interest, beginning with Can Fuster, at the bottom of Gran de Gràcia 2-4. Built between 1908 and 1911 by Palau de la Música Catalana architect Lluis Domènech i Montaner, in collaboration with his son Pere Domènech i Roure, the building shows a clear move away from the chromatically effusive heights of Art Nouveau. As you move up Gran de Gràcia, probable Berenguer buildings can be identified at No. 15; No. 23, with its scrolled cornice; and No. 35, No. 49, No. 51, No. 61, and No. 77. Officially attributed to a series of architects -- since Berenguer lacked a formal degree (having left architecture school to become Gaudí's "right hand") -- these buildings have long inspired debate over Berenguer's role in these Moderniste masterworks.