Can you tell me some Catholic sites that I can visit in the United States that are fun to go to?

There’s an old Latin phrase, de gustibus non disputatem est (“there’s no accounting for taste”). Personally, I think visiting Cathedrals is always interesting. From The National Shrine in Washington, DC, to the Western flavor of the Cathedral in Salt Lake City to the flow of humanity I’ve observed in Cathedrals from Philadelphia to Seattle, I always am amazed at the reality of the church on display in these buildings and human meeting spaces.