The walkway to Old Faithful is now paved with recycled tires
September 17, 2015, 3:30 p.m. by Matt Hickman
Forgoing asphalt helps make Yellowstone's gushing geothermal landmark even gushier.
Mercury is contaminating the Grand Canyon's fish and wildlife
August 26, 2015, 1:45 p.m. by Jaymi Heimbuch
One of the world's most loved natural wonders is getting its fill of pollution.
Spending hours staring at moss is more thrilling than you might think
August 24, 2015, 8 a.m. by Catie Leary
Olympic National Park's Hoh Rain Forest boasts a Hall of Mosses that brings in moss lovers from around the world.