This presentation is about different worlds, and how we try to unite them. One of these worlds is the world of Atlases: collections of complex, high quality maps presenting a nation to the geographically interested. The second is the world of National Spatial Infrastructures: highly organised, standardised and institutionalised large collections of spatial data and services. We describe the two worlds and their fundamental differences and we present the theoretical framework in which these worlds could be united. We introduce a test bed we are using to try out the theoretical framework in a real-life use case. In the architecture of that test bed we introduce a National Atlas Services layer and describe how we have created an Atlas Map Viewer component, using the Open Web Platform and the D3 JavaScript library.