Nature walks are good for you, but can a city stroll be just as good?

With every step on the trail, fallen leaves crinkle underfoot. The path follows a stream, rushing and burbling over smooth, gray stones, while a breeze rustles the branches overhead. Now compare that blissful mental image to what you might walk past in a city - traffic, crowds, concrete and glass. Which seems better for you?

- By ALBERT STUMM

Walking in nature has been shown to boost physical and mental health, lowering stress and restoring attention. But researchers are finding plenty of mental-health benefits to walking in urban areas, too.

Don't underestimate street trees

"Look at the green," said Whitney Fleming, an environmental psychology researcher at Bangor University in Wales, UK. "Most cities have greenery. No matter where you are, you can find a nice tree."