Pyramid of Hellinikon

37.5667°N, 22.6500°E.

The Pyramid of Hellinikon in the Argolid region of the Peloponnese, southern Greece — a small dressed-stone pyramid conventionally dated by mainstream Greek archaeology to the fourth century BCE during the Classical or early Hellenistic period. Original base 12.5 by 14 metres; original height approximately 10 metres on a single sloping square structure built of polygonal limestone blocks fitted without mortar. Excavated by the Greek Archaeological Society in the 1930s and re-examined by joint Greek–American missions in the 1980s. Function is debated: a watchtower or signal station, a fortified guard-post on the road from Argos to Tegea, a commemorative monument to a battle, or a mortuary structure for fallen soldiers all remain proposed. A controversial 1995 thermoluminescence dating campaign by the Academy of Athens produced dates approximately 2700 BCE — placing the structure at fourth-millennium BCE construction — but the methodology has been substantially criticised in subsequent peer-reviewed publications.

A small dressed-stone pyramid in southern Greece whose date is disputed by an order of magnitude between rival scientific dating methods, and whose purpose has never been securely identified.