The Wynnewood or the Castalian Springs is a National Historic Landmark in Sumner County, Tennessee featuring the largest existing log structure in the state. It was originally built by AR Wynne, Stephen Roberts, and William Cage in 1828, as a stagecoach inn for travelers. It later on became Wynne and his family’s home starting 1834, when he bought the property from his partners.
The main building of the Wynnewood measures 22 feet wide and 110 feet long. It has five other structures on site.

Aside from being a stagecoach inn, it was also best known for its mineral waters and race course. It was even believed that the former president, Andrew Jackson, frequented the place for the races.

Today, the Wynnewood is open to the public year round.