You start the afternoon getting to know two culturally and geologically important sites northwest of San Pedro de Atacama. As you stroll through the alleyways of the picturesque village of Río Grande, which seems to be from a different time, you learn about the culture, traditional architecture, and agriculture of the members of the area's indigenous community. Later, you visit the Rainbow Valley, which serves as your geological laboratory. Here, you witness one of the oldest places in the surroundings of San Pedro de Atacama, where millions of years old rocks surface in differently colored layers, giving the Rainbow Valley its name. At the end of the day, you gather on the rim of the Salt Mountain Range, above the Mars Valley (also known as Death Valley), where you can contemplate the capricious morphology of this range, as well as the gorgeousness of the Andes in the distance.