Breathtaking is all I can say. The architecture, the stain glass windows, the peace and tranquility you feel when you walk inside the cathedral is just incredible. This is diocese for all of Montana and it is worth a visit to see. It is beautiful in its simplicity. Unlike the cathedrals you would see in Europe this definitely has the Western mentality in its design...clean, simple, to the point and because of this it still manages to take your breath away. The stain glass windows are incredible and rarely have I seen so much in one building. You kind of expect it in places like England or Germany or France or even St, Patricks in NYC but to see these windows in all their glory and splendor is just awe inspiring. The folks in Helena have a lot to be proud of and definitely have some solid bragging rights when it comes to their Cathedral. Go see this. You will not be disappointed.