Claire Harbage

The quiet of the late-winter morning is interrupted by a staccato of gunshots.

"Military drills," shrugs Kim Seung-ho, 58, the director of the DMZ Ecology Research Institute, a nonprofit organization that does research on the wildlife in the Demilitarized Zone, or DMZ, which is the border area between North and South Korea. A thick blanket of fog seeps over the forested hills on this late-winter morning as Kim stands, searching the horizon for birds, on the bank of the Imjin River just north of Paju, South Korea.

Photographer Chloe Dewe Mathews' newest book, Caspian: The Elements, takes the reader on a meandering journey through oil-rich central Asia following traces of natural elements such as fire, gas, salt and water in people's everyday lives. Her images work as small, fascinating stories about how the region's residents interact with their environment in surprising ways.

Editor's note: This story was updated on Dec. 3.

On an average day at the National Butterfly Center, a 100-acre wildlife center and botanical garden in South Texas, visitors can see 100 different species and as many as 200,000 individual butterflies.

The center also sits directly in the path of the Trump administration's proposed border wall.