Finding a common linguistic ground in a city of 20 million and 500 languages.
Top-ranking cities have little relevance to emerging world cities.
Stilted homes over the water are being taken down by the government, leaving thousands homeless.
Photos from around Africa's new most populous city.
The West African metropolis has hit 21 million, surpassing Cairo.
When designed the right way, a BRT line can be a smart alternative to more expensive modes of public transit.
Government targets poorly constructed buildings amid a string of collapses