Watch Washington National Cathedral (1983) : Full Movie Online Free This program explores the mighty architectural wonders of the Cathedral Church of St. Peter and St. Paul, also known as the Washington National Cathedral, located in the northwest quadrant of Washington, D.C. Interviews, archival footage of the cathedral being built, human interest stories and more help tell the tale of this magnificent Episcopal church -- the sixth largest cathedral in the world, and the second largest in the United States.