Is Arenas Temple at Nuraxi Figus-Gonnesa in South-east Sardinia was built of rytolit. Under tholos contains a round well with rectangular staircase of 11 steps leading to. The similarity to other wells suggests a Late Bronze Age or early Iron Age date.
See:
- Maud Webster: Water-temples of Sardinia : Identification, inventory and interpretation, Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Arts, Department of Archaeology and Ancient History 2014, p. 97 - http://www.diva-portal.org/smash/get/diva2:760470/FULLTEXT01.pdf