Isopu Tower was the last watchtower to be built in Malta, apart from the tour-reduits of the 18th century.

Isopu Tower was built by the Order of Saint John in 1667 during the reign of Grandmaster Nicolas Cotoner at the expense of the Università of Gozo.

The tower has a high barrel vault with the middle floor resting on rib arches.

The tower was restored by Din l-Art Ħelwa and the Nadur Local Council between 2003 and 2006.

The restoration work was carried out by hand by Leli Saliba and his son.