Unsteady Ground... Possibly an Arena?

[Julio Juliopolis]

Note: This area is unsupervised. Post as you choose... at your own risk.Warning! This area unsafe. Sudden shifts in the ground causing quicksand have been observed. Small entrance chambers to this massive structure, (we still don't know what it was yet), are fundamentally unsound. Cave-ins are probable. Visitors are strongly advised to keep away from this area.