This essay explores the various concepts of megastructure formulated by architects of the second half of the twentieth century, understanding their great repercussion – proven by projects around the world – and the current relevance of these debates. By expressing critical thinking without the pretention of being materialized realms, this architecture is closer to art, capturing the spirit of an era and narrowing the relationship between art and architecture. The term “megastructure” and the following proposals of its modality refer to the writings and drawings of Yona Friedman, Kiyonori Kikutake, Constant Nieuwenhuys, Paolo Soleri, among other names of architecture. This paper questions the mentioned architect’s designs, and tries to conceptualize the term “megastructure” by understanding the scenario of its formulation. This work considers the architectural production as a whole (written work, representations, design and construction), understanding it as a process and not as an end.