This document summarizes a presentation given at the NETTIES 2015 conference on smart cities and open data. The presentation discusses how Amsterdam in the 16th century could be considered one of the first smart cities due to its use of open data on trade and cargo. This data-driven economy allowed for new industries like stock exchanges. The presentation also discusses how today's understanding of smart cities focuses on integration, overcoming information silos, and finding optimal transportation routes through semantic representation of data. Examples of European smart city projects are provided.