Parc Guell (1910 - 1914) In the 1890's, Gaudi was commissioned by Count Eusebi Guell to design a garden city on 50 acres of the family estate. One of the most dramatic spaces is the Room of a Hundred Columns, a cavernous covered hall of 84 crooked pillars, brightened by glass and ceramic mosaics. Above the hall is the Gran Placa Circular, an open space with a snaking balcony of colored mosaics, said to be the longest bench in the world. The mosaics, including the dragon fountain that guards the steps to the Room of a Hundred Columns, were executed by Josep Jujol, one of Gaudi's chief collaborators.