Today we have discovered a new way of representing different facts on world maps. It´s a project called The Atlas of the Real World. The authors represent the countries of the world not by their real size, but by their demographic importance on different subjects. Here you have some examples related to tourism.
This interesting book is called The Atlas of the Real World: Mapping the way we live, by Daniel Dorling, Mark Newnan and Anna Bartford and it was published byThames and Hudson.
You can also find these maps on Worldmapper. Every map includes a short explanation and they are very useful to understand many world facts:
Finally, here is the link to all the world maps about tourist: