Abstract
We develop a web service focusing on finding places not (only) by their address, but by systematically relating the places to activities that a person could perform there. This is helpful if a person wants to explore a new city, or plans leisure activities. OpenStreetMap provides a rich set of tags that can be used for activity-oriented search. We propose the use of several ontologies that are related to each other using matching tools to cope with the evolving nature of the tags available in social media.