This visualization overlays hotel data from a JSON file on an interactive Google Map of Western Europe, with a separate layer of city markers. Clicking a city marker zooms the map to that city at a predefined level. Hotel markers become visible only at higher zoom levels, while city labels disappear when zoomed in, managing clutter. The map utilizes the Google Maps JavaScript API for rendering, and D3.js (v3) is used to draw SVG circles for hotel locations and handle the data-driven overlay layer.