These are a collection of some of the mansions in Newport I saw walking around the Bellevue Avenue, Newport Cliff Walk areas. In years past, you could not take photos inside the mansions, but I read that has changed now. There is a trolley in Downtown Newport you can take to this area (parking might be difficult in the summer).
Newport - Mansions
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Within the "mansions area" of Newport, there is also Salve Regina University, containing some mansions of its own. I don't know the boundaries, but it's all fairly impressive.