The twentieth century saw the continued placement of memorials in public spaces of Barcelona, following the custom started with the celebration of the Universal Exhibition. This was the century that saw the largest number of works placed on the public roads of the city. It is noteworthy that during the turn of the century the perimeter of the city grew significantly due to the aggregation of several municipalities bordering who become new neighborhoods of Barcelona: Santa Maria Saints, Les Corts Sarria, Sant Gervasi de Casseroles, Grace, St. Andrew's Palomar and Sant Martí de Provençals in 1897, Horta 1904 and Sarria in 1921.