Absolutely beautiful place. Its so surreal and peaceful the moment you walk through the door. They do have a few rules posted at the door, but nothing crazy... more of a reminder to be respectful.
If there isn't a service going on you're free to walk the entire cathedral's first floor. Everywhere you looks is just gorgeous... and you don't know which way to go/look next. Take your time and really take in all the beauty and amazing architecture that surrounds you.
There is a mosaic museum in the basement ($2 donation) as well as a gift shop (which was closed on the day we went). Definitely worth a stop at least once when you visit the Saint Louis area.
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