The phrase "old cathedral" refers to a very old and historic church building. It generally implies that the cathedral has been around for a long time and holds historical, religious, or cultural significance. Full definition
It is this beautiful old cathedral that has been renovated into a huge event space. (lauralily.com)
But Scorsese, who was an altar boy at St. Patrick's Old Cathedral in New York City's Fashion District, wasn't bothered by these contradictions. (relevantmagazine.com)
The celebrations take place near small parish churches or in the courtyards of fine old cathedrals. (religion-online.org)