Marathon, a historically significant plain in Attica, Greece, is renowned as the site of the pivotal Battle of Marathon in 490 BC and the origin of the marathon race. Key attractions include the impressive Tumulus (burial mound) of the Athenian soldiers, the Marathon Archaeological Museum, and the Marathon Run Museum, offering deep dives into ancient history and athletic heritage. The site is generally accessible by car or public bus from Athens (approx. 1-hour drive), with facilities being mostly walkable. Visitors can explore independently, but guided tours from Athens often provide richer historical context, sometimes combining it with nearby sites. While open year-round, spring and autumn offer the most pleasant weather for exploration, avoiding the intense summer heat. Entry fees for the individual sites are typically low, making it an affordable historical excursion, with a typical visit duration of 2-4 hours for the main attractions, though a full day allows for a more leisurely pace and exploration of the scenic Lake Marathon area.