Donal MacIntyre: World's Toughest Towns

Prague is an elegant and cultured city, but it's also a place where sex is for sale and women here are forced to work as prostitutes by traffickers. It's a town where even cab drivers carry guns and gangsters fiercely protect their trade.

Donal is in Paris, a city on the edge, somewhere a conflict can occur without warning. A place where violent crime is nearly three times the national average and where anyone can get caught in the mayhem.

Odessa is a friendly town with a thriving nightlife that celebrates diversity. But beneath the surface, there's a culture of fear and intimidation.

Donal is in Dublin, a town gripped by a local gang war, where a billion-year-old drug trade is fueling the rivalry and the authorities are unable to cope.

Donal MacIntyre reveals the Turkish city of Istanbul's role as part of the Balkan Route of the European heroin trade.

Capetown is a divided metropolis, one that is both beautiful and deadly. Donal MacIntyre investigates how much crime affects those who live here.