Glide over Tehran, Iran’s sprawling capital, where the urban landscape meets the Alborz Mountains. This drone footage ...

It's therefore fitting that Flagstaff also happens to be the world’s first international dark-sky city. ... a 0.75-mile crater from a landscape-altering impact some 50,000 years ago.

In a world that's growing brighter by the year, one small gold rush town is working to keep its night dark and its skies full of stars.

M. Paul Friedberg, a landscape architect whose playgrounds, pocket parks and plazas transformed once-gritty areas of New York City, using familiar urban materials to do so, died on Feb. 15 in ...