Washington National Cathedral The Washington National Cathedral, officially named the Cathedral Church of Saint Peter and Saint Paul, is a cathedral of the Protestant Episcopal Church located in Washington, D.C., the capital of the United States. Of neogothic design, it is the sixth largest cathedral in the world, the second largest in the United States, and the fourth tallest structure in Washington, D.C. The cathedral is the seat of both the Presiding Bishop of the Episcopal Church and it