Do you want to keep driving south along the coast of Texas until you run out of this country? You're about to find a pot of gold at the end of that rainbow.
Welcome to the Lower Rio Grande Valley, or "RGV" as it is known locally. The RGV is one of the southernmost points in the Continental United States, second only to Florida. This section borders both the Rio Grande itself, which separates Texas from Mexico, as well as the Gulf of Mexico. Metropolitan areas on the United States side include Brownsville and McAllen, connected by the lowest highway number on the Interstate Highway System, Interstate 2. The RGV is accessible by several US highways, one of which is in the process of being upgraded to Interstate 69E, as part of the "NAFTA Superhighway".
While in the Lower Rio Grande Valley, one of the highlights of the trip will be a drive along Texas Highway 4 towards Boca Chica Beach. Along the route, catch a view of the Palmito Hill Battlefield. Fought during the War Between the States, this battle was unique in that it was fought after the southern generals had already surrendered in Virginia, yet their forces were able to claim victory. Head further down the road to see one of the newest and awe-inspiring developments: Starbase, Texas. Starbase is used to develop the SpaceX company's newest rocket at the time of writing, Starship. Although the road is closed during tests and launches, drivers will actually be able to drive right next to the development warehouses, the stacking high bays, the launch tower with test stands, and even see some of the rockets both retired from flight and presently in development.
If the rural life isn't your cup of tea and want something a little more bustling, head east from the highway to South Padre Island. Right along the Gulf of Mexico, this island community has built up to quite the resort destination, with high-rise condominiums and Winter Texans abound. See a dolphin or two as you take the bridge from the mainland, and park at one of the free day-use public accesses to spend time at the beach. On a clear day either on the island or along the Texas Highway 48 connector on the mainland, you may even be able to see the aforementioned Starbase and some of its activity from a safe distance.
So the next time your Internal Compass takes you southbound, consider making a stop at the Lower Rio Grande Valley.
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