Most believe that domes come from about the time of the Roman empire, and were fully perfected in the Renaissance. But actually domes have been around since at least Mesopotamian times.
Here's an example of an ancient domed structure that might also rings bells in your head when you see it. Look's very similar to Epstein's temple, right?
This structure comes from Zoroastrianism, and is called a "fire temple". They exist in both the Zoroastrian and ancient Persian cultures. Their purpose is for cleansing rituals and they somehow seem connected to mithraism, which is a worship of the Zoroastrian deity Mithra.
Mithra is the Zoroastrian god of contracts, and the keeper of truths. The cult of Mithra was popular in ancient Rome for a while, right before Christianity became more prominent.
Knowing what we know about secret societies, and how highly they place importance of secret oaths, a veneration of Mithra by them wouldn't seem so far fetched.
Mithraism includes degrees of initiation, as well as ritual enactments, as does Masonry.