The Second Temple was built in Jerusalem by returnees from Babylonian exile around 516 BCE. Some 500 years later, King Herod undertook a program of large-scale renovations and expansions, which included the still-standing Western Wall. As part of a series of depictions of the Mount throughout ancient times, the archaeologist Leen Ritmeyer has created drawings of the results. He writes:
Herod extended the Hasmonean Temple Mount in three directions: north, west, and south. At the northwest corner he built the Antonia Fortress and in the south, the magnificent Royal Stoa. In 19 BCE [he] began the most ambitious building project of his life, the rebuilding of the Temple and the Temple Mount in lavish style. . . . Today’s Temple Mount boundaries still reflect this enlargement.
Read more on Ritmeyer Archaeological Design: http://www.ritmeyer.com/2014/11/24/the-temple-mount-in-the-herodian-period-37-bc-70-ad