Nature heals.
“People have been discussing their profound experiences in nature for the last several 100 years—from Thoreau to John Muir to many other writers,” says researcher David Strayer, of the University of Utah. “Now we are seeing changes in the brain and changes in the body that suggest we are physically and mentally more healthy when we are interacting with nature.”
Source: How Nature Boosts Kindness, Happiness, and Creativity – Mindful