Every passport in the world is either red, blue, black or green.
Why is that you ask?
While there are strict guidelines and rules when it comes to these official documents nowhere does it specify the actual passport color.
While passport covers are rather basic, the artwork and technology within the pages is a whole other game.
Flip style animation of birds in flight, spectacular UV light reveals are contained in some of the world’s coolest passports. Find out which countries have these and some beautiful examples as well over at Traveller!