Cathedral Basilica in St. Louis.
http://cathedralstl.org/parish/online-tour/transept
Wow. I found this cathedral while doing some online reading and I'm just blown away by the absolute beauty and the magnificence of this church.
If I ever travel to Saint Louis, I would love to see this place.
Side note: I'm not Catholic but I have a respect for the religion. I was raised in a predominately Catholic neighborhood and so I'm used to the weddings and masses, etc. And I LOVE to look at historical cathedrals when able.
I don't believe that Dallas has anything this magnificent.
Best,
Elisabeth