Learn about Earth's biodiversity and natural resources. Plus: Explore national parks and state wilderness areas.
Yellowstone is famous for many things but topping the list is the abundance of hot springs, which are both beautiful and fascinating.
Smithsonian documentary warns that the biggest threat to the planet is us.
The National Park Service says 115 of its 401 sites could increase prices as early as next year.
The new findings suggest that Antarctica is home to 'significant areas of thick ice' that aren't included in climate models.
You, dear readers, have kept incredible photography flowing into our Photo of the Day series. Here are the 10 most popular images from the autumn season.
The Gamburtsev mountains' peaks and ridges would be the continent's highest spot...if only their icy ceiling would melt.
Aerosols from volcanoes cool the Earth by blocking some solar radiation and reflecting it into space.
Hike to the Canyon District of Yellowstone National Park and you'll be in for a spectacular view.
Waterfalls come in all sorts of shapes and sizes. Test your knowledge of these natural wonders.
'Nova' special explains the devastating geological phenomenon and how we can prepare for it.
This unusual lake is already a surreal place to visit. But add to that a spectacular sunset and you have a set for a sci-fi movie.
The Nature Conservancy's Urban Water Blueprint details how natural conservation methods in key watershed areas can improve water quality in more than 500 global cities.
The glowing yellow leaves of an aspen grove left us wondering: Why are these trees so unique?
This arctic spot has many amazing features, but these five are what draw in travelers.
Learn about this gorgeous Norwegian time-lapse, which was almost 3 years in the making.
Activist and author blogs about politics, energy and Earth's resources.
Science journalist blogs about humans and other wildlife.