The Stadium at Nemea in the Corinthia region of Greece was built around 330 BC when the biennial Nemean Games returned from Argos. Its 600-foot clay track hosted foot races honoring Opheltes as part of one of four pan-Hellenic athletic festivals alongside Olympia, Delphi, and Isthmia. The stadium features a remarkable 36-meter vaulted entrance tunnel -- one of the earliest known in Greece -- with dozens of ancient graffiti scratched by athletes into its walls. Excavated from 1974 to 1981 by UC Berkeley under Professor Stephen Miller, the site could hold an estimated 40,000 spectators.
Stadium at Nemea

| Type | Megalithic structures |
|---|---|
| Period | 1500 - 500 BC |
| Country | Greece |
| Coordinates | 37.8070° N, 22.7148° E |
Greece