Ollantaytambo is probably the most well known ruin site in the valley after Machu Picchu and Sacsayhuaman. The town is full of hostels and hotels as well as good cafes and restaurants. There is also a museum in the town that goes further into Incan history. It is quite interesting to visit.
The ruins themselves are quite steep with many many stairs leading up to an area that would have been for great scholars, upper classes of military, and of course those of royal blood. Besides the stairs leading up to the top of the ruins are many terraces on which agriculture would have been cultivated. At the bottom of the ruin site stands a bath house for those of noble or royal blood - and it is said that this bath house may specially have been used by the few young girls who would have been brought up to be sacrificed by the gods. These few girls would have been chosen at a very young age from noble families who would have considered it an honour to have been chosen. The girls would be raised with the utmost in education at the time. At the tender age just during puberty the girls would have begun a slow steady and very harsh trek with top Incan members of spiritual practice from the Sacred Valley, it has been hypothesized, to the volcanos surrounding Arequipa in the central part of Peru. I would assume that a trek like this may take a few months or even much longer and of course due to the altitude both the sun and the cold would have been extraordinarily harsh. A number of mummies of children who seem to be of noble blood have been found nearing the tops of a couple of these volcanos. It has been studied and said that the majority of these children would have come from Cusco because that was the Incan centre. There is a museum in Arequipa that gives much more knowledge and insight into these areas of expertise They feature a very well preserved mummy there - the most famous one - Juanita. The first time I had gone to the museum Juanita was on loan to Harvard or Yale - this happens frequently so make sure to check that you are going while she's at the museum if that is your interest. This time I was lucky enough to see her and truly she is a very well preserved mummy.
On another note there is an amazing story around the general Ollantay and his chosen love an Incan Princess. This story based on historical events but also in part fiction is interesting, but that is a whole other post - for another time.