Baltimore is the largest city in the State of Maryland, and the 30th-most populous city in the United States. Baltimore was established by the Constitution of Maryland and is an independent city that is not part of any county. Founded in 1729, Baltimore is the second-largest seaport in the Mid-Atlantic. The city's Inner Harbor was once the second leading port of entry for immigrants to the United States and a major manufacturing center. With hundreds of identified districts, Baltimore has been dubbed a "city of neighborhoods". Baltimore has more public statues and monuments per capita than any other city in the country, and is home to some of the earliest National Register Historic Districts in the nation, including Fell's Point, Federal Hill, and Mount Vernon, which were added to the National Register. Baltimore is in north-central Maryland on the Patapsco River close to where it empties into the Chesapeake Bay. The city is also located on the fall line between the Piedmont Plateau and the Atlantic Coastal Plain, which divides Baltimore into "lower city" and "upper city". Baltimore is almost completely surrounded by Baltimore County, but is politically independent of it. It is bordered by Anne Arundel County to the south. Baltimore lies within the humid subtropical climate zone, with four distinct seasons.
Baltimore's history and attractions have allowed the city to become a strong tourist destination on the East Coast. It exhibits examples from each period of architecture over more than two centuries, and work from many famous architects such as Benjamin Latrobe, George A. Frederick, John Russell Pope, Mies van der Rohe and I. M. Pei. The city is rich in architecturally significant buildings in a variety of styles. Baltimore Harbor's restoration has made it "a city of boats", with several historic ships and other attractions on display and open for the public to visit.