Texas is the frontline for a summer invasion. Millions of free-tailed bats descend upon Bracken Cave, creating the largest bat colony on Planet Earth.
The rolling plains of the Texas panhandle belong to more than cattle and cowboys - this is also the land of claw, spine, and fang.
The unforgiving Border Swamp that resides between the Texas - Louisiana state line is home to an infamous history and wild creatures.
Between Death Valley's searing temperatures and the alpine air of Mount Whitney lies a 146-mile stretch that only the hardiest can survive.
The Texas border hides a desert Eden, where the Rio Grande meets mountains: Big Bend.