Pronounced "spa-dee-na," as the avenue should be but never is, this 1866 house is filled with arts and artifacts of the James Austin family, prominent in the natural gas, railroad, and banking businesses. Members of the family lived here from Victorian times until 1982, when it was turned over to public ownership. The 50-room house has been restored with period wallpaper, upholstery, and furniture, and crystal chandeliers burn softly with natural gas. Docents tend the magnificent gardens and the small orchard; they make jam in summer and bread in winter and give guided tours. COST: $5.