From CBS News.

Mexico City is home to 22 million residents, making it one of the largest metropolitan areas in the world. It was built on a large lake system, evident in the district of Xochimilco, a network of canals dating back to the Aztec Empire. Today, it’s a UNESCO World Heritage site that brings the past to life. Michelle Miller has more.

"CBS Saturday Morning" co-hosts Michelle Miller and Dana Jacobson deliver two hours of original reporting and breaking news, as well as profiles of leading figures in culture and the arts. Watch "CBS Saturday Morning" at 7 a.m. ET on CBS and 8 a.m. ET on the CBS News app.

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