This document discusses the symbolic values and roles of historic walls. It begins by outlining the aims of examining how walls can better communicate cultural heritage and foster civic engagement and sustainable development. It then explores the historical functions of walls as defense, boundaries, and containers. The document analyzes the social divides walls can represent and provides examples of wall typologies and possible interventions. It discusses challenges in conserving walled cities and their heritage values, and provides recommendations for people-centered and sustainable approaches.