Lynn is the 9th largest municipality in Massachusetts and the largest city in Essex County. Situated on the Atlantic Ocean, approximately 10 miles (16 km) north of downtown Boston, Lynn is part of Greater Boston's urban inner core. An early colonial settlement and industrial center, Lynn was long colloquially referred to as the "City of Sin," owing to its historic reputation for crime and vice. Today, however, the city is known for its large international population, historic architecture, downtown cultural district, loft-style apartments, and public parks and open spaces, which include the oceanfront Lynn Shore Reservation; the 2,200-acre, Frederick Law Olmsted-designed Lynn Woods Reservation; and the High Rock Tower Reservation. The city also is home to the southernmost portion of the Essex Coastal Scenic Byway, Lynn Heritage State Park, and the National Register-listed Diamond Historic District.