Circular structures are architectural designs characterized by their round shape. These structures can be found in various forms, such as buildings, bridges, and monuments. The circular design often provides stability and can enhance the aesthetic appeal of a structure. Examples include the Colosseum in Rome and the Pantheon, both of which showcase the strength and beauty of circular architecture. In nature, circular structures are also prevalent, such as in the formation of bubbles or the arrangement of cells in biological organisms. These natural circular patterns often serve functional purposes, like maximizing space or distributing forces evenly. Understanding circular structures helps in various fields, including engineering and biology.