Santu Antine ("Saint Constantine"), also known as Sa domo de su re ("The house of the king" in the Sardinian language) is a nuraghe (ancient megalithic edifice built by the Nuragic Civilization) in Torralba, one of the largest in Sardinia.

The main tower originally reached a height of 23–24 metres and contains three tholoi chambers on top of each other.

Some 27 meters long corridors built with the corbel arch technique can be observed inside of the Nuraghe, superimposed on two floors, the Nuraghe was provided with three wells.

These claims were supported, among others, by the archaeologist Ercole Contu and archaeostronomists Mauro Peppino Zedda, Juan Antonio Belmonte and Michael Hoskin.

[2][3] In particular, Hoskin, science historian and emeritus professor at Churchill College in Cambridge, called Santu Antine "the most sophisticated dry stone monument on earth's surface".