Sand Dunes Trail, Salida, United States. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3302763/free-photo-image-road-moon-astronomy-cc0Free Image from public domain licenseRolling sand dunes form a trail in the desert at dusk. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3289391/free-photo-image-blue-sky-cc0-coldFree Image from public domain license