Shalom Avi,

Thank you very much for the excellent question.

1) It would be possible to answer simply that although it is not possible for foreigners to enter the Beis ha'Mikdash to personally witness the miracle, the miracle was publicized throughout the world, and this very publication is the testimony that the Shechinah resides b'Yisrael.

2) However, many of the Ba'alei ha'Machshavah discuss this miracle of the Ner ha'Ma'aravi, and they distinguish it from the other miracles that were in the Beis ha'Mikdash, since the idea of ​​candles and the light of the Menorah is symbolic of ​​the inner light that the Menorah in the Beis ha'Mikdash spreads spiritually, beyond the physical light. As the Gemara continues, the light that lit the Menorah was not for the purpose of illuminating the Mishkan or the Beis ha'Mikdash with physical light, but only as spiritual light and testimony of the Shechinah.

3) In the book Afikei Mayim on Chanukah (comprised of the Shi'urim of Rav Moshe Shapira zt'l), the author talks about your question (Shi'ur 19). He asks your question along with other questions. Another important question is that the Gemara here is learning about the Menorah light as an "Edus" from the verse that talks about the Paroches ha'Edus. Accordingly, we find that the light of the Menorah is evidence of the Paroches, or actually the Torah that is behind the Paroches. So the light of the Menorah actually testifies to the light of the Torah, and in fact the light testifies to a whole set of more internal values ​​that the Torah espouses, while the nations of the world illuminate the world with a natural candle and with only human wisdom.

He explains there the Ramban's words at the beginning of Parshas Beha'alosecha, that Hash-m comforts Aharon ha'Kohen and tells him that his lighting of the Menorah is greater than the sacrifices of the Nesi'im, since it is eternal, and the Ramban writes that the words refer to the candles of Beis Chashmonai, which are lit even during the destruction when there is no Beis ha'Mikdash. That is, the light of the Menorah that illuminates the inner light of the universe, and the inner reason for the Creation and existence of reality, is continued by the Chanukah candles at the entrance of every home, to show the authority of the Torah and its values.

In conclusion, the evidence is that there is a light that is part of the simple reality, and it shows that with a deeper observation, there is a profound understanding for the existence of the world. This does not require physical seeing of the Menorah, but rather this testimony is incumbent on the Kohanim who light the Menorah in the Beis ha'Mikdash and on us, to show the nations of the world the alternative that must be offered to explain the creation and the existence of the universe.

Kol Tuv,

Aharon Steiner