The article explores the history and current state of urban planning in Spain, where people predominantly live in apartments, and examines the factors that have led to this phenomenon. It discusses the role of population density, migration, and government policies in shaping the country's urban landscape. The article also touches on contemporary trends in urban planning, including the pursuit of compact, complex, and cohesive cities. Spain's experience is compared to other countries, such as the Netherlands and the US, to highlight differences in approaches to density and urban development.