The Denniston House is a historic building located at 117 East Front Street in Cassville, Wisconsin. The house was built by a firm from New York City when Wisconsin was still the Wisconsin Territory. At the time, Cassville was considered likely to be selected as the capital of the future state and the house was thought to figure prominently in the future of the poten…The Denniston House is a historic building located at 117 East Front Street in Cassville, Wisconsin. The house was built by a firm from New York City when Wisconsin was still the Wisconsin Territory. At the time, Cassville was considered likely to be selected as the capital of the future state and the house was thought to figure prominently in the future of the potential capital. However, the city of Madison was instead chosen. The house was later owned by Nelson Dewey, the first Governor of Wisconsin after it had become a state. Dewey opened the building as a hotel in 1854.