[2][3] In addition to at least two pyramids which no longer exist, there are two surviving pyramid-like structures still available to study, one at Hellenikon and the other at Lygourio, a village near the Ancient Theatre of Epidaurus.

Here took place a fight for the throne between Proetus and Acrisius; the contest, they say, ended in a draw, and a reconciliation resulted afterwards, as neither could gain a decisive victory.

Later on in 1937, more excavation was made by the American School of Archaeology at Athens under the direction of L. Lord who concluded that both the structure at Ligurio and the one at Cephalaria were "guard houses capable of accommodating a small garrison who could control the countryside and be safe behind their walls from surprise attacks by a few persons.

"[7] Amongst the findings are a large pithos, the floor of the long corridor and the room, re-carved from repairs, entrance door, and parts of the wall, infill from earlier excavations.

Some ceramics of Early Helladic II period (2800–2500 BC) were identified by Saul Weinberg, a member of the team.

She argues that they undertook their research using a novel, previously untested methodology in order to confirm a predetermined theory about the age of these structures.

[17] Liritzis responded in a journal article published in 2011, stating that Lefkowitz failed to understand and misinterpreted the methodology.

The entire monument is built from grey limestone from the district in the form of large blocks used in a trapezoidal/partially polygonal system.