The Washington National Cathedral, is a cathedral of the Episcopal Church located in Washington, D.C.. Of neogothic design, it is the sixth largest cathedral in the world, the second largest in the United States. There are many works of art including over two hundred stained glass windows, the most familiar of which may be the Space Window, honoring man's landing on the Moon, which includes a fragment of lunar rock at its center donated by Apollo 11 Astronaut Michael Collins.
The cathedral is filled with memorials to persons or events of national significance: statues of Washington and Lincoln, state seals embedded in the mosaic floor of the narthex, state flags that hang along the nave, stained glass commemorating events like the Lewis and Clark expedition and the raising of the American flag at Iwo Jima.
