The temple of Angkor Wat was much larger and more complex than previously thought, University of Sydney’s archaeologists have discovered.

Researchers from the University of Sydney have used ground-penetrating radar, airborne laser scanning (LiDAR) technology, and targeted excavation to map the great pre-industrial temple.

The team discovered a spiral structure which has dimensions of more than 1500m×600m, running along the south side of Angkor Wat.

In the paper, the researchers say “the huge, unique and problematic structure of the ‘rectilinear spirals’, has never previously been recognized or even predicted, or supposed, and it still defies explanation.”

Along with this, they found eight buried towers, which were demolished during construction of the main temple. The researchers believe this may be the remnants of an ancient shrine.

The researchers found evidence of roads, ponds, and mounds, which may have been used by workers of the temple.

It has previously been assumed that enclosed spaces within Angkor Wat indicated cities or towns. Moats, walls, and other infrastructure kept each area contained.

Researchers believe that these closed off urban areas differed significantly from the regions outside.

Wooden structures found at the site suggest that Angkor Way may have enhanced its defense capabilities near the end of its operation. Construction of these structures is thought to be one of the last major builds to take place at the temple.