Kopisch described his explorations in The Discovery of the Blue Grotto on the Isle of Capri, which tapped into the Romantic era’s interest in the spiritual and healing powers of nature.

The Blue Grotto (or Grotta Azzurra) is the most famous site on Capri, and it's easy to see why. The grotto is a natural sea cave with a small entrance, and it is illuminated in a blue and silver ...