A business trip to London last month, a day visit in Cologne next saturday and romantic weekend in Paris in autumn - this example exhibits one of the central characteristics of today's tourism. People in the western hemisphere take much pleasure in frequent and repeated short term visits of cities. Every city visitor faces the general problems of where to go and what to see in the diverse microcosm of a metropolis. This book presents a computational framework for the generation of personalized city tours - as extension of the Open Location Specification of the Open Geospatial Consortium.