Photos of Luanda, Angola, tell a tale of two cities: sprawling poor neighborhoods and a glitzy waterfront. Saul Loeb/Getty Images; Michael Gottschalk/Getty Images hide caption

itoggle caption Saul Loeb/Getty Images; Michael Gottschalk/Getty Images

Riot police cordon off areas at Singapore's Race Course Road on Sunday to maintain order following a riot Sunday in the Little India neighborhood. Eighteen people were injured. Then Chih Wey/Xinhua /Landov hide caption

itoggle caption Then Chih Wey/Xinhua /Landov

Mah Bow Tan, a member of Singapore's Parliament, inspects Chinese cabbage growing at the commercial vertical farm. Troughs of the veggies stack up to 30 feet in the greenhouse. Courtesy of MNDsingapore. hide caption

itoggle caption Courtesy of MNDsingapore.

A reflection of the Marina Bay Esplanade in Singapore. The nation is increasingly seen as a corporate logistics hub and gateway to the region's emerging markets. Vorrarit Anantsorrrarak/Barcroft Media/Landov hide caption

itoggle caption Vorrarit Anantsorrrarak/Barcroft Media/Landov