The relationship between architecture and urban planning on the one side, and peace and conflict on the other, has increasingly been acknowledged. After all, the built environment does not only reflect a physical structure, but also manifests social, economic, and political factors that form part of a society’s daily life, giving meaning to places and helping form identities. While, for example, divided cities are key sites in territorial conflict over state and national identities, cultures, and borders, the architecture of buildings can facilitate or hinder human interaction. Consequently, the built environment can serve as a powerful lens to understand and shape behavior. Exploring this link and seeking sustainable options to facilitate peace through architecture and urban planning lies at the heart of the architecture-and-peace nexus.