The U.S.-Mexico border, stretching nearly 2,000 miles, varies dramatically by location; in San Diego, towering steel barriers meet the Pacific, while Texas sees the Rio Grande as its border, placing neighborhoods mere yards apart.
Arizona and New Mexico reveal vast deserts and rugged mountains, with stretches of fencing breaking the landscape's openness.
Some areas are heavily fortified with security measures, while others are only marked by a simple fence or sign.