The fortified hill of Kolonos, located near the modern-day site of Thermopylae, is believed to be the place where King Leonidas and his remaining Greek warriors made their final stand during the Battle of Thermopylae in 480 BCE. After two days of holding back the massive Persian army, the Greeks were betrayed by Ephialtes, who revealed a secret mountain path to the Persians. Surrounded and vastly outnumbered, Leonidas, his 300 Spartans, and a few hundred Thespians and Thebans retreated to Kolonos Hill to fight to the death. Excavations have found spearheads and arrowheads, confirming intense fighting in the area. Today, Kolonos stands as a symbol of ultimate bravery and sacrifice. A monument near the hill honors the fallen warriors, with a plaque quoting the famous epitaph: "Stranger, tell the Spartans that here we lie, obedient to their laws." The hill remains a sacred site and a powerful reminder of the values of courage, duty, and freedom.