Most of these European immigrants settled in the cities which offered jobs, education and other opportunities enabling them to enter the middle class. Many also settled in the growing small towns along the expanding railway system and since the 1930s many rural workers have moved to the big cities. Urban areas reflect the influence of European immigration, and most of the larger ones feature boulevards and diagonal avenues inspired by the redevelopment of Paris. Argentine cities were originally built in a colonial Spanish grid style, centered on a plaza overlooked by a cathedral and important government buildings. Many still retain this general layout, known as a "damero", meaning checkerboard, since it is based on a pattern of square blocks. The city of La Plata, designed at the end of the 19th century by Pedro Benoit, combines the checkerboard layout with added diagonal avenues at fixed intervals, and was the first in South America with electric street illumination.