A hypogeum temple within a vast karst cave. The cave entrance opens into a natural chamber with pools of water and stalactite concretions. About 130 m on is the temple, at a depth of about 95 m. A huge stalagmite measuring 180 cm across was used as an altar. Many objects dating back from 820 to 730 BC have been found here. Other interesting findings include pips of Vitis vinifera, dated approximately 3800 years ago and which to date are the oldest grape pips found in Sardinia, making Santadi the earliest known grape-growing place on the island.