Baltimore, MD

ZIP code 21270 covers the area of Patapsco Valley State Park near Halethorpe, Maryland. This picturesque park features the Thomas Viaduct, a historic stone railroad bridge, and the Patapsco River, offering recreational activities such as hiking, biking, and picnicking. Visitors can also explore the ruins of the Henryton State Hospital, a former tuberculosis sanatorium with a hauntingly beautiful abandoned aesthetic.