This example visualizes a single point feature from a GeoJSON file, showing the location of the Hippo House at Zoo Berlin. The map uses d3.geoPath to render the geographic coordinates as a projected point, while the properties object supplies the title, series, and tour metadata for tooltips or labels. The code references a YouTube embed link for the featured image, though it does not display the image itself. The data comes from a gist authored by CliffordAnderson, and the marker size and symbol are specified as properties but are not applied in the visible rendering. The example demonstrates how GeoJSON geometry and non-spatial attributes combine in a minimal D3 mapping context.