Photograph by Jeff Nelson, National Geographic Your Shot
Tourists flock to a lone tree along the path of Hadrian’s Wall in northern England. Built between 122 A.D. and 128 A.D., the wall spans a 73-mile neck of land between the Tyne and the Solway Firth—a solid northern boundary for the entire Roman Empire. It’s often considered the most important relic of Roman rule in Britain.
“I wanted to get the photo without people, but that wasn’t possible,” says photographer Jeff Nelson. “In the end, I feel they give the photo better perspective.”
Photograph by Brian Skerry, National Geographic
In other places around the world, coral has been decimated by bleaching and disease, but the southern Line Islands’ reefs retain their resilience. Scientists believe the key to coral health is intact ecosystems, where all the native species—including planktivores such as the vividly marked Achilles tang seen here—play their part.