Though it is the largest and most populous of the islands, Jersey still has plenty of open space.

BBC: The Channel Islands�� surviving lore

With 20 million people, more than the populations of Libya, Lebanon and Jordan combined, Cairo is the largest city in Africa and the Middle East. (By contrast, the most populous city in the United States, New York City, is a bit more than 8 million.) Cairo's size has increased more than sixfold in the past 60 years.

CNN: STORY HIGHLIGHTS

Nigeria is sub-Saharan Africa's second-biggest economy after South Africa's and the world's eighth-largest oil exporter, yet the continent's most populous country (with 140m-plus citizens) has yet to fulfil its economic potential.

ECONOMIST: Doubts persist about Nigeria��s banks

If government policies can successfully steer growth, this should propel the two most populous countries in the world, China and India, to become the largest economies in future decades.

FORBES: Small Caps Are The Rocket Stocks Of Emerging Markets