There is now a short essay about Jim and Nancy Forest's last day of pilgrimage in Rome when they went to the Basilica of San Lorenzo Fuoiri le Mura (St Laurence Outside the Walls). This turned out to be among the best preserved and most beautiful ancient churches in Rome. Probably it was one of the churches Merton found in his search for early Christian iconography.
Jim wrote an essay to accompany the day at San Lorenzo here. Without having to search through guidebooks and history books, you will be able to see the photographs with much knowledge and understanding. The photographs from this day are in a folder on Flickr here.
Thank you again, Jim and Nancy, for sharing your pilgrimage. The photos are so stunning, I keep looking at them again and again. Like ikons, they convey silence and so much mystery.