VANZI is a virtual world platform for infrastructure planning. It aims to improve on traditional approaches by allowing for more stakeholder engagement, reuse of data and models, and testing of "what if" scenarios. Current roadblocks include difficulties accessing and combining GIS data, a lack of tools for creating interactive 3D models, and government/utility conservatism. VANZI seeks to address these by developing standards, tools, and an open-source platform to tie existing resources together and support ongoing projects visualizing city infrastructure and freight transport systems.