The Talmud says:
It is taught in a baraita: Rabbi Elazar HaKappar says: In the future, the synagogues and the study halls in Babylonia will be transported and reestablished in Eretz Yisrael. [Megillah 29a]
From this passage the Maharsha concludes that synagogues are considered parts of Eretz Yisrael (and so benefit from the blessings in Deut 11:18-21). Just as embassies throughout the world are considered part of the represented country.
So, on Hanukkah, should we say "nes gadol haya po" in the synagogue? (A great miracle happened here -- not there (sham).)