Ahhh... Now I know what that dome is!
For a number of years, every time I took the took the bus and train between Washington, D.C., and New York I would see this huge colorful building dome off in the distance and wonder what it was. I always made a mental note to look it up when I got off the train, but I would always be overwhelmed by the energy when I arrived in Washington or New York and promptly forget that task. Then, tonight, I was reading about the Pope's visit to Washington in USA TODAY and his visiting the National Shrine of the Immaculate Conception, and I tried to imagine where that shrine might be and it suddenly dawned on me that maybe it was that mysterious dome I would see north of Washington. I did a quick image and map search in Google and sure enough, it in fact was "my" dome. Mystery solved. Personally, I always imagined it was a mosque since it was so brightly colored. So much for first visual impressions.
Even this picture does not do the dome justice:
Or this one:
The full name is Basilica of the National Shrine of the Immaculate Conception.
I am not religious, but I do find dramatic architectures interesting.