In the heart of Utah’s Uinta Mountains, a team of scientists is re-creating historical pictures to study how much, and how quickly, ecosystems are changing.

As ever-larger telescopes are launched into space or built at high-altitude sites, these observatories still have wonders to share with visitors and astronomers alike.

An enigmatic photograph by America’s most famous landscape photographer led to a forensic hunt to identify exactly when and where it was taken.