Basilica of the National Shrine of the Immaculate Conception
Washington, D.C.
This is the largest Catholic church in North America and the tallest habitable structure in DC — taller than the Capitol dome — yet it sits in a residential Northeast neighborhood most Mall-bound travelers never drive through. Inside, more than 80 chapels and mosaic domes represent immigrant Catholic communities from Lithuania to the Philippines, each one a small embassy of someone's homeland.
Why Roamward picked it
Genuine beyond-the-Mall detour with real scale-of-story payoff; free to enter, family-friendly, and distinct from the Smithsonian-cluster gravity well — coordinates sourced from an aggregator rather than a surveyed NPS-style point, so tier marked approximate pending a sharper source.
Sources
Hours, admission, and access change — confirm with the official source before you plan the detour.
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