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Something that always seems to make tourists' travel lists, no matter their actual interest? Churches and cathedrals. Every city, it seems, has a towering steeple or beautiful stained glass windows deemed a must-visit on any trip, and for good reason -- these houses of worship often display such feats of architecture, you have to see it to believe it. Here are 10 of just such cathedrals whose designs will take your breath away.