A world map displays simulated hotel check-ins and checkouts across multiple cities, with circles sized by guest counts and colored to indicate business versus leisure travel. A time-brushing histogram below filters the map data by date range. Built with React and D3, the visualization uses `d3.geoNaturalEarth1`, `d3.geoPath`, and `d3.scaleSqrt` for mapping and scaling, while `d3.brushX` enables interactive temporal selection. Data is generated procedurally, simulating guest arrivals and departures over 20 days.