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We are the only megacity in the world that has mountain lions roaming the streets; only Mumbai and its leopards even compare.

A building has collapsed in Nigeria’s megacity, Lagos, once every two weeks on average so far this year.

Others in this megacity have been dipping into Manila Bay, flouting rules that prohibit swimming in its polluted waters.

President Erdogan, 70, led his party's election campaign, vowing a new era in Turkey's megacity of almost 16 million people.

Now Mr Erdogan, who was born in this megacity of 16 million people, wants it back and the vote is on a knife-edge.