Jerusalem = Heaven

Canterbury Tales has an interesting post entitled "14 Biblical Names for Jerusalem (and How to Read the Psalms like a Catholic)"

Excerpt:

Saint Paul identifies the communion of saints in Heaven as "Jerusalem" and as our mother: “But that Jerusalem which is above is free, which is our mother” (Galatians 4:26, D-R).

This is another reason why Catholics refer to the Church as the New Jerusalem and as Holy Mother Church. When Catholic priests, monks, and nuns chant the 150 Psalms of David, they often mentally apply the meaning of "Heaven" or "Church" to those passages that refer to "Jerusalem." Saint Paul's use of allegory in Galatians serves as an interpretive key to reading the Old Testament in a spiritual way.

Read the rest here.