How Passports Work

10/27/2015, 2:36:05 PM , duration(0:0:2)
Society & Culture
The concept of passports - that people should enjoy protected freedom of movement - is an ancient one. It wasn't until WWI that they became universal. Learn all about this overlooked, important document.<br><br>Learn more about advertising on the HowStuffWorks podcasts at <a href=''></a><br><br>And to learn about your ad choices when listening to podcasts, visit <a href=''></a>