A sample of some web mapping projects

Urban Growth in the Venice of Dust

The history of Sana'a, the capital of Yemen, stretches back millennia into legend- according to tradition the city was founded by one of the sons of Noah. Sana'a has been continuously inhabited for over 2,500 years, making it one of the oldest cities in the world.

Today, despite the Yemeni civil war and frequent airstrikes, Sana'a is changing rapidly. Population growth has exploded, turning what was a sleepy city of 55,000 in the 1960's into a sprawling hub of two million today. Housing and water resources are increasingly under strain. While Yemen remains the poorest country in the middle east, Sana'a is ranked in the top five fastest growing cities in the world.

Click through the layers to explore Sana'a's transformation from medieval to modern city.

24 Hours on the CityBike Network

Watch a day of rides on New York City's bikeshare system.

Crime and Housing Vacancy Rates in Philadelphia

A look at Philadelphia's developing neighborhoods