Highcharts Pie-Donut Chart using TourPedia Data

This pie donut chart is constructed using highcharts and it uses the TourPedia data. TourPedia contains information about accommodations, restaurants, points of interest and attractions of different places in Europe. Now it provides information about Amsterdam, Barcelona, Berlin, Dubai, London, Paris, Rome and Tuscany. The pie donut chart shows, in the inner pie, the amount of data grouped by city and, in the outer donut, the amount of data grouped by venue categories for a certain city.