Travelling the world with your drone is getting easier with foldable drones that now fit into a small travel bag, such as the Mavic range from DJI, the Anafi range from Parrot and many others...
But you can't fly just anywhere, and there are rules to follow. Each country has its own drone regulations, whether for leisure or commercial (professional) flying. It's not easy to find the regulations for each country, let alone maps identical to the Géoportail map we have in France.