Beauty, as an innate human need, has always been at the core of art and architecture. Architectural decorations, as a means to fulfill this need, not only enhance the aesthetic appeal of structures but also play a key role in their longevity and impact. This study aims to investigate the role of decorations in the sustainability of architectural works by addressing the following questions: On what principles are architectural decorations based? And what factors make a structure enduring in the public memory? It analyzes the characteristics of effective decorations in architecture. The research employs a mixed methodology of library and field studies with a descriptive-analytical approach. First, by reviewing Iranian architectural works and then examining the practices of global architects, the study explores the significance of beauty and decorations in Iranian and global cultures, with the Azadi Tower as a case study. Findings indicate that appropriate architectural decorations possess four key characteristics and, when harmonized with local culture and expressed innovatively, can become a decisive factor in the longevity of structures. This research emphasizes the importance of decorations not merely as aesthetic elements but as identity-forming and enduring components of architecture.