In historical Coptic Cairo, I walked around the corner from Roman Babylon"s Hanging Church to the 4th-Century Church of Abu Serga, built over the family"s next major stop. The church encloses a sacred cave, which is thought to be among the family"s longest-serving places of rest and is among the trail"s holiest stations. The site is neatly labelled in Arabic and English for the crowds that bottleneck at the narrow set of stairs leading down to the crypt where the family resided for three months.