The Space-Time Data Explorer aims to be an interactive data visualization tool designed to improve how users explore and interpret time-based and geospatial datasets published through the City of Cambridge Open Data Portal. Many datasets in the portal contain rich temporal and spatial dimensions, but are difficult to analyze using existing static tables or isolated visualizations. This project proposes a general-purpose, web-based exploration tool that allows users to visually examine how events, trends, or conditions change over time and across geographic space. The tool emphasizes intuitive interaction, enabling users to explore datasets through linked maps, timelines, and filters rather than requiring advanced technical skills. While designed around Cambridge data, the project is intentionally platform-agnostic so it can be adapted for other cities that use Socrata.