How this Green book helped black travellers in the US
17 December 2016 Last updated at 00:15 GMT
Before the passing of the Civil Rights Act in 1964, racial segregation was legally enforced in parts of the United States.
Travelling on the road was filled with uncertainty and danger for black people.
But in 1936, postal worker Victor Hugo Green produced The Green Book Guide - a travel guide which listed everything from petrol stations and lodgings to doctors, churches and department stores that would serve black customers.
The BBC Travel Show reports.
Watch more clips at The Travel Show website.