Historic National Prayer Service held at Washington National Cathedral for victims of the September 11 attacks. A similar service is held in Canada on Parliament Hill, the largest vigil ever held in the nation's capital.

The Cathedral Church of Saint Peter and Saint Paul in the City and Episcopal Diocese of Washington, commonly known as Washington National Cathedral or National Cathedral, is a cathedral of the Episcopal Church. The cathedral is located in Washington, D.C., the capital of the United States. The structure is of Neo-Gothic design closely modeled on English Gothic style of the late fourteenth century. It is the second-largest church building in the United States, and the third-tallest building in Washington, D.C. The cathedral is the seat of both the presiding bishop of the Episcopal Church and the bishop of the Episcopal Diocese of Washington. Over 270,000 people visit the structure annually.