Gonz�lez Videla prepared the "Plan Serena", a project in which the city was renewed with investments and urban redevelopment that would imprint a single seal on the country. It began to take hold in the role of services, to rescue and to develop its own architectural style known as Colonial Revival. The city is the seat of theRoman Catholic Archdiocese of La Serena. The Cathedral, built from the same stone, dates from the 19th century. It must be said that although it lacks the same historical value as the older churches, this is a stone building in a country prone to seismic activity, and has survived various earthquakes. Indeed, during centuries of existence, there is almost no visible damage. All of these churches, along with others of minor importance, provide a unique urban landscape, an image for the city, giving it the nickname "The City of Churches."
Its traditional architecture consists of a series of housing and public buildings, of late 19th-century vintage style, built with wood from the US state of Oregon brought to Chile as counterweight in vessels sailing to the nearby port of Coquimbo to load copper and other minerals for transport back to the US. This Oregon pine and the use of adobe create the genuine image of the city.
There is also a number of remarkable and valuable small churches built of sedimentary stone quarried 5 km (3 mi) to the north of the Elqui River, having a characteristic color and texture formed by myriad small shells. These churches are all roughly 350 years old and have undergone restoration to varying degrees, bringing them back to their original form. San Francisco, San Agust�n, Santo Domingo are the names of a few of them. In 1920, he began to take shape a new economic boom in the mining of iron, attracting capital and human contingent, resulting in a further change in the urban structure.
Currently, the city has its own architectural style (known as "neocolonial"), which is differentiated from other
