Buy Iron + Sand Wine Online. The natural draw of the historic hot springs, Iron Spring and Sand Spring, propelled Paso Robles into a bustling destination known as California’s oldest watering place. Never bound by preconceived notions, this Cabernet could only ever be made in Paso Robles, California. Once known for its thermal mineral springs as a rest stop for travelers along El Camino Real, Paso Robles is today known for producing world class wine. Made to defy expectations of a typical Cabernet Sauvignon, Iron + Sand is true Paso.