Earth’s atmosphere is thousands of miles long, but only a fraction can sustain life. Here's a look at how small Earth's habitable zone is.
Where are the world’s highest cities? This graphic ranks the world’s major urban centers by altitude above sea level.
Mountains have inspired humans for centuries. But while Everest and Kilimanjaro might ring a bell, do you know the true meanings behind their names?
This stunning set of 3d maps purposefully exaggerate the elevation scale to show you the mountains of both the United States and North America.