Urban jungles—concrete sidewalks, high-rise buildings, miles of paved roads, and traffic—proliferated in the 20th century. But in more recent decades, many cities have been more aggressive about reintroducing nature into their landscapes as well as sustainable design. “Green spaces,” including parks and community gardens, can promote better mental and physical health, according to the World Health Organization, and they offer environmental benefits.
Flip through our slideshow to discover how some cities around the globe are greening up.













