From the Wikipedia page [1]

The Hillforest Mansion, also known as Thomas Gaff House, is located at 213 Fifth Street, in Aurora, Indiana. It is built on a bluff above the Ohio River.

Built in 1855 in the Italian Renaissance architectural style, the two-story home's design by Isaiah Rogers reflected Gaff's involvement in the shipping industry; its full-width frontal porch is reminiscent of a steamboat's deck. The mansion, which was designated a National Historic Landmark in 1992, is owned and operated by Hillforest Historical Foundation.

The website is [2].