The city of Boston is served by Boston Logan International Airport. Visitors can then access various means of transportation into the city including public transportation and taxi services. Unlike other American cities which often follow a grid format, Boston was once a narrow peninsula which has translated into streets that wind and turn in many directions. Visitors who plan to travel on foot are well advised to bring a map with them to avoid getting lost. Boston has one of the lowest crime rates in the United States for a city of its size, although visitors should take general precautions especially at night.