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I couldn't find any relevant information about a restaurant named "Basilica of the National Shrine of the Immaculate Conception". However, I found that the Basilica of the National Shrine of the Immaculate Conception is actually a large Roman Catholic basilica located in Washington, D.C. It's not a restaurant but a place of worship.

If you're looking for information about a specific restaurant, please let me know its correct name or location and I'll do my best to provide a summary introduction within 300-500 words.