The Artemision, also known as the Temple of Artemis or Ionic Temple, is located on Via Minerva, a side street connected to Piazza del Duomo in Syracuse, at the highest point of the island of Ortigia. (Entry from the Italian Wikipedia page, CC BY-SA. Location marked by the OpenStreetMap community.)
In the app, check in on site: you earn a point and the AI guide tells you about the place in your language.