Moon Valley (Valle de la Luna) is a stunning desert landscape near San Pedro de Atacama, Chile, known for its otherworldly rock formations, sand dunes, and dramatic sunsets. Accessibility can be challenging due to the uneven terrain, with some areas requiring hiking. While solo visits are possible, guided tours are highly recommended for safety and to learn about the geological history. There aren't strict seasonal restrictions, but the best time to visit is during the shoulder seasons (spring and fall) to avoid extreme temperatures. The cost typically ranges from $15 to $50 USD per person for a tour, including park entrance fees. A typical visit lasts around 3-4 hours, often timed to coincide with sunset for the best views. Be sure to bring water, sunscreen, and a hat, as the desert sun is intense.