Afghanistan is one of the world's poorest countries, wrecked by decades of conflict which led to the rise of the Islamist fundamentalist movement, the Taliban.
Despite the fall of the Taliban after the US-led invasion of Afghanistan in 2001, the security situation remains tense as extremists continue to stage regular attacks.
US National Security Adviser H.R. McMaster met with Afghan President Ashraf Ghani and other senior Afghan officials. The visit comes just days after the US dropped an 11-ton MOAB bomb on a mountain hideout for militants.
Kabul is one of the fastest growing citiesi in the world. 6 million people now live in the city that was planned for 700,000. The city's transportation infrastructure can't cope and the many cars contribute to air polluton that's worse than in Beijing. But the city’s new mayor, Abdullah Habibzai, a trained civil engineer, has made it his mission to implement a new Green Urban Mobility Strategy.