Megiddo is mentioned several times in the Old Testament, and once in the NT (Rev. 16:16). In the Old Testament, nearing the close of the kingdom of Judah, good King Josiah (r. 640-609 BC) was mortally wounded there in battle by Pharaoh Neco of Egypt, who was en route to Carchemish to war against Babylon. The international highway, the Via Maris, connected Egypt to Mesopotamia, so Neco was on that route, which passed through the strategic site of Megiddo.
However, Josiah would not turn away from him, but disguised himself in order to make war with him; nor did he listen to the words of Neco from the mouth of God, but came to make war on the plain of Megiddo. The archers shot King Josiah, and the king said to his servants, “Take me away, for I am badly wounded.” So his servants took him out of the chariot and carried him in the second chariot which he had, and brought him to Jerusalem where he died and was buried in the tombs of his fathers. All Judah and Jerusalem mourned for Josiah. Then Jeremiah chanted a lament for Josiah. And all the male and female singers speak about Josiah in their lamentations to this day. (2 Chron. 35:22-25, NAU).
One of the sites my group visited in November ’16 was Megiddo.
Here is a view of some of the archaeological excavations in foreground, with another view of the plain/valley below.
These photos help provide the setting for the texts that mention biblical Megiddo.
Click images to enlarge.