Trees grow in the Great Smoky Mountains National Park, Tennessee.
Detail of a backhoe’s tracks at a construction site near McKinney, Texas.
The LyondellBasell Tower rises ominously into the sky over Downtown Houston.
Mountaintops obscured by clouds in Tennessee’s Great Smoky Mountains National Park.
Refrigerated containers, or reefers, stacked in a container yard in Galveston, Texas.
Prehistoric basalt flows at California’s Mojave National Preserve.
A tree grows in a foggy landscape on the outskirts of McKinney, Texas.
A section of track on the Lookout Mountain Incline Railway, Chattanooga, Tennessee.