Train to the clouds. As the name tells, it is a day trip by train up in the mountains to La Povorilla at 4220 meters over the sea level. Runs from April to November, two times a week (Wednesday and Saturday) with extra services during the high season (Easter & winter holiday). Cost USD120 (USD140 high season). Book by phone (0800-888-NUBES), online or a couple of days before at any city excursion office. The trip takes a whole day, leaving Salta at 7:15am and returning between 23:00 and midnight. The dining car on the train and the bar car are a bit expensive but you are allowed to bring your own food. A breakfast and afternoon snack is included. Coca leaf tea helps prevent altitude sickness and coca leaves are provided by the train staff. There are nurses on board and oxygen for those who suffer ill effects from the altitude. The trip is long and the seats are somewhat cramped for leg space but generally the services and staff are excellent. The experience is fantastic as the scenery is rugged and variable with a feast for the eyes at every turn. The engineering of the track was a masterpiece in its day and continues to impress decades later.