Examining swelling urban borders over the past 100 years.
Roughly 60 percent of Mexico's federal prison population is serving time for drug crimes.
Which cities attract the most people, and what kinds of communities are losing them.
In places like Istanbul and Mexico City, BRT is cleaning the air and saving commute time.
Enjoy a $230 dinner while strapped in 150 feet above ground.
Stories of workers who survive on difficult work and little money.
Martin Adolfsson photographs upper-class subdivisions around the world without permission.
Animal care organizations report a quadrupling of kidnappings in recent years, buoyed by robust ransom opportunities.
North American cities are producing substantially less wealth per ton of greenhouse gas emissions than their European counterparts.
The electrical infrastructure in Mexico's capital did not respond happily to Sunday morning's quake.
A photographer captures the routine madness of Mexico's largest subway system.
Gary Hustwit and Jon Pack have been photographing former Olympic sites around the world.
Popocatépetl is a fire-and-smoke-belching monster that just happens to be remarkably easy on the eyes.
Mexico City's "Menos sal, más salud" encourages restaurant owners to make salt shakers available only for those who request them.
A surprisingly large number involve cars.
Peatónito is the alter ego of Jorge Cáñez, a 26-year-old political scientist in Mexico City.
Innovative programs have helped turn the city from one of the world's most dangerous places into one of the safest areas in Mexico.
At least 14 people are dead; scores more are still buried beneath the rubble.
Mexico City's surreal adventure with Heydar Aliyev.