If you have already covered all the usual suspects in DC, I highly recommend the National Cathedral. I am DC resident and bring all our guests here because it's a bit of a hidden gem - it's always quiet and peaceful and great for any weather (since it's indoors). Oh, and it's free (well, they have a suggested donation, but it's up to you what you want to give)! It really does look like one of the huge cathedrals you would see in Europe. If you go, definitely go up the elevator to the viewing area - it affords great 360 views. And, if the weather is nice, check out the lovely, charming garden around the side.
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