We're looking for the home of the world's newest metro for the Geo Quiz. This rapid transit system has been in the works for 30 years.
Now, the ribbon cutting ceremony is over and today, North Africa's first metro line is shuttling around some of the 3 million plus residents in the North African city we're looking for.
The answer is Algiers, the capital of Algeria.
Marco Werman talks with Algerian blogger Elias Filial.