To prepare for the project proposal and to give you some inspiration for your project, we have listed a few data sources that you can access. Let us know if you know of other sources and/or if one of these sources is not accessible anymore.
Worldwide: Sustainable Development Goals Data for Good (Facebook) Google Earth Engine Worldbank Shapefiles ArcGIS Hub Shapefiles Natural Earth Data
US: visitdata.org
Europe: Eurostat database list Eurostat cities data
Netherlands: data.overheid.nl https://opendatanederland.org Shape files of different administrative levels: