The Broad Wall of King Hezekiah
2 Chronicles 32:5
He (Hezekiah) acted with vigor, rebuilding the whole breached wall, raising towers on it, and building another wall outside it. He fortified the Millo of the City of David and made a great number of arms and shields.
Watch the video by the City of David Megalim Institute expounding on the construction of the Broad Wall, courtesy of George Blumenthal and the Gol Family
Overview
In the Bible
He (Hezekiah) acted with vigor, rebuilding the whole breached wall, raising towers on it, and building another wall outside it. He fortified the Millo of the City of David, and made a great quantity of arms and shields.
וַיִּתְחַזַּ֡ק (חזקיהו) וַיִּבֶן֩ אֶת־כָּל־הַֽחוֹמָ֨ה הַפְּרוּצָ֜ה וַיַּ֣עַל עַל־הַמִּגְדָּל֗וֹת וְלַח֨וּצָה֙ הַֽחוֹמָ֣ה אַחֶ֔רֶת וַיְחַזֵּ֥ק אֶת־הַמִּלּ֖וֹא עִ֣יר דָּוִ֑יד וַיַּ֥עַשׂ שֶׁ֛לַח לָרֹ֖ב וּמָֽגִנִּֽים..."