The fault lines between highly segregated neighbourhoods have been linked to higher crime rates and mental health issues.
The pastiche-style poster art ubiquitous in Egyptian houses and businesses reveals how locals imagine far-off landscapes, idealise nature and define beauty.
What do border walls cost? And do they work?
The logic behind building a wall is centuries old. But can concrete solve the complex problems the U.S. is facing today?
Donald Trump, if he takes the US presidency, will immediately start building a wall between Mexico and the US. What lessons can he take from that celebrated wall-builder, Chairman Mao?
In response to high levels of crime, South Africans have turned their homes into fortresses, seeking security behind high walls. But doing so might be counter-productive.