Overtourism, characterized by the detrimental effects of excessive tourism on local environments and communities, has become a significant challenge in popular tourist destinations globally. This chapter examines how sustainable architectural design and interventions can ease these pressures, with a particular focus on Shahjahanabad, the historic walled city in Old Delhi, India. By reviewing urban and architectural approaches aimed at balancing visitor demands with the need to preserve cultural heritage and support community welfare, this research outlines a framework for evaluating tourism development through technological solutions. The study reviews notable examples from both Shahjahanabad and various global locations, assessing how creative architectural solutions have successfully mitigated the negative effects of overtourism while maintaining the historical integrity of cultural landmarks. Approaches such as smart technologies, effective crowd management, and the repurposing of heritage structures are explored as potential pathways to harmonize tourism with sustainability. Key questions guide the research: How can technology promote sustainable architectural approaches in historical cities? What are the broader impacts of overtourism on local populations, and how can design solutions be formulated to address these? The research methods include extensive literature analysis, case study comparisons, and fieldwork conducted in Shahjahanabad. The study's findings underscore the importance of integrating modern technology with sustainable design to curb the detrimental impacts of overtourism. The chapter ends by considering how lessons from Shahjahanabad can serve as a guide for future tourism planning in heritage-rich cities, advocating for models that prioritize environmental, cultural, and societal sustainability.