by Akiva at Mystical Paths
I don't know what defines a great synagogue, but the largest synagogue in the world today stands in the middle of modern Jerusalem. Commanding an awesome presence in the Jerusalem skyline stands the Belz Beis HaMedrash HaGadol, the Great Synagogue of Belz Chassidus. The synagogue seats over 6,000 in the main sanctuary, and has numerous side halls and sanctuaries.
I can't think of a better sight standing out in the Jerusalem skyline than a shul.
and a brief video about the inside. Apparently it also has the largest aaron kodesh (where sefer torahs are kept) in the world.
Posted at Mystical Paths. Read it elsewhere? Stop by the source.
BS"D - בסיעתא דשמיא