To call the properties that appear on this week's top five countdown homes is using the definition pretty loosely. If you click on the slideshow below and take a peek at the exteriors that belong to the most expensive Hamilton County home sales in 2015, the words more likely to come to mind are "castle," "fortress," "villa" or "MTV Cribs" (if you're a product of the '90s like myself). I even triple-checked the Hamilton County Auditor's property records as I was typing up the descriptions on the…