Istanbul Urban Database (IUDB) is an interactive sustainable web mapping application for research and the public. IUDB blends a wide range of historical data, and is the most comprehensive online archive of Istanbul’s urban history. The project aims to preserve collective memory, and architectural and urban heritage of Istanbul in an open-access multimedia platform. By implementing 'interactive deep mapping' approach, the project presents a set of tools for users to develop historical narratives, uncover hidden cultural and social histories and eventually become part of this digital platform by contributing to it in many forms. Integrating architecture and urbanism into digital and spatial humanities, IUDB explores how emerging spatial and visual tools advance the field of history and urban research.