Beautiful and informative post over at Mystical Paths---
...According to a tradition handed down from the Gaon of Vilna's talmidim, the Gaon had said that the Churvah would be built and destroyed twice and when rebuilt a third time, it would be a sign of the coming of Moshiach. The Hurvah Synagogue will be be getting its keystone of the dome in 2 weeks. (Right before Pesach?)
Destroyed twice like the two Batei Mikdash...
Heard in a shiur last night with Dr. Dan Altura:
David Hamelech conquered Jerusalem, but he was not allowed to build the Beit Hamikdash. He ruled forty years and then Shlomo became king and he built the Beit Hamikdash at the beginning of his forty-year reign.
We re-conquered Jerusalem in 1967. Forty years ended with Rosh Hashana 5768, so now we can expect it anytime.