The remote border between southwest Texas and Mexico is among my favorites. It follows the Rio Grande and dips down into Texas’s big bend (following the river), entering several of the least visited parks in the nation: Big Bend Nat’l, and State, Parks. TX Farm Road 170 has to be the most beautiful border-hugging road, as it curves, winds, and rollercoasters over the Rio Grande’s many tributaries and washes. It is so remote, during an early visit I spotted a speed limit posted in kilometers, not miles. Enjoy the ride. [please hover over images for captions]