Hi Mustafa,
I have been to the National Cathedral in Washington, D.C., our beautiful capitol where my son is attending his last semester of University.
It is primarily a stone Gothic Structure, like the ones of the Middle Ages in France and England.
Gothic Church Architecture has always been my favorite...with Byzantine being a close runner up!

The pointed arches seem to reach up to Heaven, and leave a person in awe. The windows are decorated with what we call 'stained glass' (different colored glass) and depict different religious scenes.This is a traditional religious decorative art of Western Christianity.
I am glad that you liked the photos.
All the best,
Alice