Tel Megiddo is a sixty-acre mound rising above the southern edge of the Jezreel Valley, commanding the pass through the Carmel ridge that every army from Thutmose III to Allenby has had to cross. James Henry Breasted's University of Chicago Megiddo Expedition worked the site from 1925 to 1939 on a Rockefeller endowment, stripping major portions to bedrock and establishing the basic stratigraphic sequence. Israel Finkelstein and David Ussishkin's Tel Aviv University expeditions resumed work in 1994 and have continued through the present, refining the chronology by surgical exposure rather than wholesale clearance. Twenty-six occupation layers run from the Chalcolithic through the Persian period — roughly 3500 BC to the late sixth century BC. Two finds stand at the center of the site's biblical importance. The first is the six-chambered city gate identified with 1 Kings 9:15, which lists Megiddo among the cities Solomon rebuilt alongside Hazor and Gezer. The dating of the Solomonic stratum is one of the most contested questions in Iron Age archaeology — Yigael Yadin assigned the gate to the tenth century BC and Solomon's reign; Israel Finkelstein's "low chronology" reassigns the same architectural horizon to the early ninth century BC and the Omride kings. The debate is genuine and unresolved; both readings remain in active scholarly literature. The second is the strategic pass itself: 2 Kings 23:29–30 and 2 Chronicles 35:20–24 record that Pharaoh Necho killed King Josiah at Megiddo in 609 BC as Necho marched north to support a collapsing Assyria — a death that ends the last Davidic reform of Judah. The mountain's Hebrew name — har-megiddo — gives Revelation 16:16 the apocalyptic place-name "Armageddon." Megiddo is a UNESCO World Heritage Site; the Chicago expedition's records and finds are at the Oriental Institute and the Rockefeller Museum. Sources: Robert Lamon and Geoffrey Shipton, Megiddo I (Oriental Institute Publications, 1939); Yigael Yadin, Hazor: The Rediscovery of a Great Citadel of the Bible (Random House, 1975), with comparative Megiddo material; Israel Finkelstein and David Ussishkin, Megiddo III–V final reports (Tel Aviv University, 2000–2013); 1 Kings 9:15; 2 Kings 23:29–30.
Megiddo's twenty-six occupation layers anchor the contested chronology of Israelite state formation, supply the architectural test case for debating Solomonic versus Omride building programs, document the historically verified death of Josiah in 609 BC, and furnish the Hebrew toponym that becomes Revelation's eschatological battlefield designation.