History

The hypogeum came to light by chance in 1902 when construction workers in the town of Paola, excavating a cistern beneath a new residential block, broke through the roof of an ancient chamber. The site was initially investigated by the Maltese Franciscan priest Fr. Emmanuel Magri, who began preliminary documentation before his death in 1907. Systematic excavation was then conducted between 1903 and 1911 by Themistocles Zammit, the archaeologist who also excavated the Tarxien Temples, and who recognised the hypogeum as one of the most significant prehistoric discoveries in Mediterranean history. Among the finds recovered during these early campaigns was the celebrated “Sleeping Lady” — a terracotta figurine of a reclining female figure, approximately 12 centimetres long, now displayed at the National Museum of Archaeology in Valletta. Its precise meaning remains debated, but it is widely interpreted as representing a figure in ritual sleep or incubation, possibly connected to practices of dream oracles.

The hypogeum was constructed in three main phases over roughly a thousand years. The Upper Level (c. 3600–3300 BC) is the oldest and most irregular, likely beginning as natural cave formations later worked by hand. The Middle Level (c. 3300–3000 BC) contains the principal ceremonial spaces, including a series of corbelled rooms whose architectural vocabulary — niches, façades with trilithon doorways, painted red ochre spirals and honeycombs — directly mirrors the free-standing megalithic temples built above ground on Malta during the same period. This architectural echo between subterranean and surface sacred architecture is unique in the prehistoric world. The Lower Level (c. 3150–2500 BC), reached by a long staircase, served primarily as a repository for the dead, eventually holding the skeletal remains of approximately 7,000 people deposited over centuries.

The site was first opened to the public in 1908 and remained accessible without restriction for much of the twentieth century. Mass tourism caused severe humidity damage to the painted surfaces and fragile limestone carvings, prompting a major restoration and conservation project in the 1990s. Since then, visitor numbers have been capped at 80 per day — a figure that remains among the lowest of any major UNESCO World Heritage Site in Europe — and environmental monitoring systems now track temperature and humidity continuously to protect what little painted decoration survives.