St. Pauls Outside the Walls stands near the Abaazia delle Tre Fontane, where St. Paul is believed to have been beheaded. The largest church in Rome until St. Peters was rebuilt, the basilica also rises over the traditional site of its namesakes grave. The most recent edifice was constructed after a fire in 1823. The first basilica was also Constantines doing.
Constantines building projects enticed the first of a centuries-long parade of pilgrims to Rome. From the time the basilicas were first built until the empire crumbled under barbarian invasions, the two churches, although miles apart, were linked by a roofed colonnade of marble columns.