34 unusual maps you absolutely need to see to understand the world

11. Population density world map

12. Driving orientation

13. The longest straight sea route (20,000 miles – 32,000 km)

14. The sense of European citizenship

15. World population by latitude and longitude

16. Most popular sports by country

17. Red hair frequency in Europe

18. If the entire world population lived in one city, how big would it be?