A stone block with two carved spirals blocks the entrance into the second set of apses of the Central Temple. In the doorway, as in many other doorways on site, there are pairs of interconnected holes on opposite sides. These indicate points where screens or doors could have been used to close off physical access, or even visibility, to what was happening in certain parts of the temple.
The Tarxien Temples date from 3600-2500 BC and are the most complex of all temple sites in Malta, consisting of four megalithic structures.
The temples are renowned for the detail of their carvings, which include domestic animals carved in relief, altars, and screens decorated with spiral designs and other patterns. Of particular note is a chamber set into the thickness of the wall between the South and Central temples, which is famous for its relief of two bulls and a sow. The site seems to have been used extensively for rituals, which probably involved animal sacrifice.
Tarxien is also of great interest because it offers an insight into how the temples were constructed: stonerollers left outside the south temple were probably used for transporting the megaliths. Remains of cremation have also been found at the centre of the South temple at Tarxien, which indicates that the site was reused as a Bronze Age cremation cemetery.
This feature seems to have constituted a focal point in the South Temple. The lower half of the original was carved out of a single block of stone. The plugged cavity hewn within its decorated surface, served as a cubbyhole in which a number of Flint knives and burnt animal bones were found. The upper half of the alter was constructed with smaller slabs, creating a small space which contained burnt animal remains.