In order to discover the 'hidden gem' in different cities, TravelSupermarket has selected data that shows: The least reviewed 5-star attractions on TripAdvisor. To collate this data, a list of the world’s most popular cities was collected. We then took to TripAdvisor and scraped the attractions in the "Sights & Landmarks" and "Nature & Parks" categories. The highest rated attraction with the least reviews was selected as the ‘hidden gem’ in the city. Attractions that were considered unfitting for the two categories above (i.e. those not deemed a "Sight & Landmark" or "Nature & Park") were excluded from the data set and a minimum review count of 50 and a maximum of 1,000 was selected for each thing to do. You can view the data and image attributions here - all correct as of March 2019.