There are multiple reasons to visit Machu Picchu, it is not just its importance for the nowadays world. It was very important for the ancient Andean people, but it is also really important nowadays for Andean people because it is the best example of how extraordinary was the civilization in ancient times.
The most popular itinerary is the 2 days and 1-night tour because it is perfect to spend one night in Aguas Calientes town due to its magical landscape and as a previous to visit Machu Picchu.