St. Mary's City is a historic site in St. Mary's County, Maryland, United States. It was the fourth permanent English settlement in North America and served as the capital of Maryland from 1634 to 1695. St. Mary's City is now an open-air museum and archaeological site, showcasing the history and culture of the colonial period. Visitors can explore reconstructed buildings, learn about colonial life, and discover artifacts unearthed through archaeological excavations. The site also includes St. Mary's College of Maryland, a public liberal arts college.