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Those are allegories describing attributes of the Heavenly Jerusalem,
the Body of Christ Jesus.
The "gold streets" are the Path upon which they walk,
the Narrow Way of Christ's Testimony,
which is the Spirit of all Prophesy (Scripture Prophecy).
Peter also said each one in Christ is a stone of its walls,
another allegory.
There are no actual gold streets,
no more than those in Christ are actual stones in walls.