Please visit http://rpubs.com/kumar-navya/dataproduct-leafletwithcode for version with visible code
Note: circle size proportionate to population size
Click on a city for popup with details
Note: circle size proportionate to GDP, custom icons show leading economic sector
Click on a city for popup with details
Note: labels show city name and latest annual ITA in millions
Click on clusters to zoom into multiple tourist attractions (custom icons with popups)
Data sources include:
1. Wikipedia
2. Business World
3. World Economic Forum
4. Government of Delhi
5. Euromonitor