In 1902 a stone mason was laying foundations to build a few houses when he came across this huge cave. Temi Zammit took over the excavation process which resulted in fantastic archaeological findings such as human bone, tiny carved animals, pottery items and figurines as well as ornamental beads and amulets. Such was the greatness of this work, that he was made a Knight.

Spread across an area of about 500 m squared; this Hypogeum has its halls, chambers and corridors dug out from rock, with various shapes and sizes. There are 3 levels, each representing an era: the upper level from years 3600 to 3300 BC is made up of a large cavity with a passage in the middle and burial cutouts on either side, while the middle one from years 3300 to 3000 BC has numerous rooms which are finished very smoothly, much like that of built stone. (Very impressive indeed, considering the scant tools they had to work with in those days).

A strict regulation of the temperature and humidity level ensures its perfect conservation.

UNESCO has inscribed this site in its World Heritage List.