The Tumulus of Marathon is the burial mound of the 192 Athenians who fell at the Battle of Marathon in 490 BC. It rises about 9 metres from the coastal plain and has stood for 2,500 years, a grassy dome surrounded by a low fence on what was the battlefield. The mound is one of the most intact ancient monuments in the Attica region, and its location on the open plain — with mountains behind and the sea visible to the east — makes the site unusually atmospheric.
A path circles the mound, and interpretation panels explain the battle's context and the significance of the burial. The surrounding landscape is still agricultural, and the contrast between this quiet place and the drama of what happened here is genuinely striking. The tumulus is reached by a short drive or walk from the Archaeological Museum; both sites are typically covered together. Entry is included in a combined ticket with the museum.