central-plan building type architecture.
What were the major changes in the plans for the new St. Peter's from the old ones? The apse was facing west to show Peter's upside-down crucifixion. In the new apse it is oriented east towards the rising sun.
This meant that Roman temple architecture was primarily external architecture. Christian architecture was more interior-focused, as Christianity was an enigmatic religion that required initiation to participate in religious practice.
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