The eastern wall of the Har Habayis is 466 meters (1530 feet) long. This wall is not exactly on the north-south axis, rather it is on an angle of 6 degrees to the north. The southern part of this wall is at an angle of around 93 degrees compared to the southern wall of Har Habayis, but at 73.2 meters (240 feet) away from this corner, the wall turns slightly to the east, so at a point 198.12 meters (650 feet) from the south-east corner, the wall is 2.43 meters (8 feet) to the east of a line in production of the first 73.2 meters (240 feet).
In the southeastern corner of the expanded Har Habayis, there was a tower, the remains of which can be seen in the eastern wall. This made a nice visual balance to the eastern wall of the Har Habayis, as it had towers on both ends.
When Hurdus expanded the Har Habayis, he made his expansion on one flat level. However, the original mountain slopes down, so they had to build vaulted chambers, as well as fills of earth and other stuff, to support the Har Habayis surface. Although most of these vaults were destroyed during the Churban, the southeastern vaults were later rebuilt, and support the southeastern part of the current plaza. This vaulted area is known as Shlomo's stables. The original vaults were probably used as storage rooms; and had windows to let in light. Near the triple gate, a window frame was found, this frame had grooves for metal bars, as well as holes for the hinges of the shutters to open and close it.
As mentioned in a previous post, running along the southern wall was a stepped walkway, 6.4 m (21 ft) wide. This walkway was built on top of rooms with vaulted roofs, these rooms most probably were stores. When the Romans destroyed Yerushalayim, they filled these stores up with wood, and lit them on fire. (The burning of this area of Yerushalayim is mentioned by Josephus, Wars 6:6:3.) The Har Habayis is mostly built from limestone, which crumbles and turns into powder when exposed to very hot temperatures (This is how lime (סיד) is made). Before these stores and the walkway totally collapsed from the heat, the fire left a burnt imprint on the Har Habayis wall, which was the back wall of these rooms, in the shape of the interior of these stores. These burnt marks have enabled us to figure out how the stores looked. (When the stones are examined closely, you can see that a semicircular line was scratched into the wall to help the builders build these vaults correctly.)
I have added sixteen pictures of the third Beis Hamikdash, as well as a new map of it.
My name is Mendel Lewis.
Hashem said to Yechezkel, "Its reading in the Torah is as great as its building. Go and say it to them, and they will occupy themselves to read the form of it in the Torah. And in reward for its reading, that they occupy themselves to read about it, I count it for them as if they were occupied with the building of it. (Tanchuma tzav 14)