Dark tourism, defined as travel to sites associated with death, suffering, disaster, and collective trauma, has become an increasingly visible component of contemporary tourism systems. While prior research has explored its ethical, cultural, and experiential dimensions, limited attention has been paid to its spatial characteristics and the potential of geospatial technologies to support sustainable governance. This article addresses this gap by conceptualizing dark tourism as a spatially embedded socio-economic phenomenon and examining the role of Geographic Information Systems (GIS) and Web-GIS technologies in its analysis, planning, and management. Adopting a "global-to-local" multi-scalar perspective, the study integrates global trends, European policy frameworks, and the underdeveloped yet promising case of Greece, complemented by comparative methodological reflections. Drawing on an extensive interdisciplinary literature review, the article demonstrates how GIS-based approaches enhance understanding of dark tourism typologies, accessibility, visitor dynamics, and socioeconomic impacts. Web-GIS platforms are further examined as tools for participatory planning, ethical interpretation, and transparent decision-making, particularly in contexts characterized by sensitive heritage and contested memories for modern approaches. The findings indicate that, when embedded within robust governance frameworks, dark tourism can contribute to regional diversification, local development, and cultural sustainability. At the same time, spatial analysis reveals risks of uneven development and commodification. By positioning GIS as both an analytical and governance framework, this article advances dark tourism as a multidimensional spatial entity and offers practical insights for sustainable tourism and heritage policy.