 The wharf and the 19th-century Custom House Block were recognized as a National Historic Landmark in recognition for the role they played in the history of Boston and its importance as a major 19th-century shipping center.The Big Dig put the Central Artery below ground level, which partially restored the original close relationship between Long Wharf and downtown.Since ca.1990, Long Wharf has been transformed from a failing commercial waterfront area into a recreational and cultural center.