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The Pythian Games at Delphi
The Olympic games are the best known, but were not the only of the games of ancient Greece. Next in prominence to them were the Pythian games which took place at Delphi every four years and two years after the Olympic games.
The stadium sits at 645m elevation above the sea, some 100m above the entrance to the main site.
... after the Crisaean war, in the time of Eurylochus, the Amphictyons instituted equestrain and gymnastic contests in which the prize was a crown, and called them Pythian Games. -- Strabo, Geography 9.3.10
The stadium as it exists today is a mixture of work from the Classical and Roman periods.
7,000 can sit in the stone seats along the north side. The track is 600 Roman feet in length.
Games at Delphi were established ca. 586 BCE.
(1986 photo.)
The starting blocks are at the far end of this image. The main site of Delphi is downhill to the right.
The starting blocks.
Detail of starting structure.
The other (west) end of the stadium.
This may be a well, but I have not found an authoritative source.