Historic homes


My wife is mad about historic homes that offer tours and admission to the public. I thought she'd love to have a theme holiday where we can tour the country and visit them. My new Nuvi 750 would be ideal to plan a route for that purpose. Has anyone seen such a POI?
On such a long trip I might need to have my car serviced too so I also ask if there is a POI for Subaru dealers as well.

Thank you