Herod's Temple

Herod's Temple in Jerusalem was a massive expansion of the Second Temple along with renovations of the entire Temple Mount.  Herod the Great's expansion project began around 19 BC. The renovation by Herod began with the building of giant underground vaults upon which the temple would be built so it could be larger than the small flat area on top of Mount Moriah. Ground level at the time was at least 20 ft. (6m) below the current level, as can be seen by walking the Western Wall tunnels. The edge of this platform remains everywhere; part of it forms the Western Wall.
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