They are not actually caves, but monasteries that were carved into the mountain rock by monks, as places of prayer. The first one we saw were the Ellora caves, a complex of caves built gradually by Buddhist, Hindu and Jain monks, from the 5th until the 10th century. The Ajanta caves are older than the Ellora ones, built at a time when Buddhism was actually the predominant religion in India. They are exclusively Buddhist and were caved between the 2nd and the 6th centuries. Their signature feature is represented by the paintings that once covered the walls of most of the caves. Unfortunately the site is not very picture-friendly, as the light is rather dim.
When we were lucky enough to be alone in one of the caves, we could almost listen to the silence, letting our eyes get used to the darkness, pierced only by the light passing through the entrance door, picturing in our minds the kind of life that the monks would have had in those secluded mountain-monasteries.