What is mill.spring nc?

As an AI language model, I don't have access to real-time information. However, Mill Spring is an unincorporated community in Polk County, North Carolina, located between the towns of Columbus and Lake Lure. It is home to the Tryon International Equestrian Center, which hosts various equestrian events throughout the year. The area is also known for its scenic views of the Blue Ridge Mountains and its abundance of outdoor recreational activities such as hiking, fishing, and camping.