An interactive world map visualizes the cost of living index per country using a color scale from dark green to dark red. Clicking a country opens a modal pop-up containing a radar chart that breaks down the cost of living into five attributes: rent, cost of living plus rent, groceries, restaurant prices, and purchasing power. The visualization uses d3.geoPath for the map projection and d3.radialLine for the radar chart, with data loaded from a CSV file and topojson for country boundaries.