This affinity, or perhaps deep recognition, is part of a very great mystery. Sacred spots also include geographic places where people have found powerful healing elements, such as herbs, waters, or minerals. These places may also be the locations of personally transformative experiences, or where visions and prophecies have been revealed. As interesting and true as these definitions are, there is something more, something which underlies all of them.
Sacred spots are places where humans communicate with the divine.
This communication involves a dialogue, a reciprocity, and so in these places the divine communicates with humans. The most conventional definition of the sacred is a belief in, or knowledge of, intangible powers. I believe intangibles are involved, but there is more. But, if the sacred is a quality of something then it can be discovered in the same way that gold can be discovered. I find this view limited and potentially alienating.