Why should you visit this small private square fenced in by wrought iron? Well, its gorgeously preserved federalist architecture is unique to the country for one. These magnificent townhouses rarely trade hands, but when they do they command upwards of $11 million dollars! Famous residents include, architect Charles Bulfinch, painter John Singleton Copley, and author Louisa May Alcott. Today, Secretary of State John Kerry is a contemporary resident of the square. See if you can spot the Secret Service agents as you walk past.