Formal Dining Room in the Hammond-Harwood House, Annapolis, Maryland

Here is what Wikipedia: Hammond-Harwood House has to say about this house:

The house ranks architecturally with many of the great mansions built in the late Colonial period; however, it is the only house directly inspired from a plate in Palladio’s, I Quattro Libri dell’Architettura. It is arguably the most exquisite house remaining from the Colonial period in America.

I haven't seen a lot of Colonial Era houses or one that allowed visitors.