Very subjective here depending on your intent, but as for me, a few items are noteworthy. The Declaration of Independence, George’s Washington’s farewell address, Frederic Bastiat’s The Law, and this: Idols for Destruction: The Conflict of Christian Faith and American Culture
by Herbert Schlossberg, Charles W. Colson (Foreword by), Robert H. Bork (Preface by). Just a thought.
If the person is just visiting, I doubt they’re looking to learn the history of American culture, government, or literary trove.
I’d give ‘em a sight-seeing guide and tell ‘em to never walk alone at night.