The Millennium Gate serves as a transition, one you notice, between the lakeside row of residences and the boutiques and commercial offices in Atlantic Station. Made of Indiana limestone, the gate extends 100 feet in the air from the three-acre Lake Hylia, and 82 feet from 17th St. Outside, the Romanesque architecture and iron tables and chairs create the feeling of a European plaza. Inside the gate, is a 12,000-square-foot museum with three historically-decorated rooms. The museum features exhibits that highlight Georgia history, architecture, culture and philanthropy.