One of the most dramatic buildings is the Grand Tomb at Hili. More than 4,000 years old, the structure is 12 metres in diameter and must originally have stood at least 4 metres tall. Restored in the mid-1970s, the building was left unroofed. However, it would have been roofed in antiquity.
Next to the Grand Tomb is Hili Site 1, once a tower built from mud brick that would have stood several metres high. Excavated in the 1960s by Danish archaeologists at the invitation of the late Sheikh Zayed bin Sultan Al Nahyan, it was found to have a thick circular wall, within which were several rooms, served by a well in the centre of the building. Only the foundations of this building remain today.
A similar structure, Hili 10, is located nearby and also has a well at its centre. Its 3-metre wide circular wall suggests that it was once a stronghold, perhaps controlling trade routes across the region. Other structures at the Hili site include a large round building surrounded by a moat dated to the period 3000 BCE to 2000 BCE.
The Hili area also features a falaj irrigation system, which used ground-level and underground water canals to bring water from the nearby mountains, and the remains of several villages, both from the Iron Age.
Several Iron Age villages also were excavated, including Hili Site 17, with at least three houses. Excavation at one of the five houses shows the village may have been involved in pottery production. The house walls were built of mud brick and still stand several metres high.
Another site, Hili 2, contains many houses with well-preserved walls, some standing 2 metres tall. Large storage jars found inside indicate a prosperous community possibly due to the presence of the nearby falaj irrigation system.