Mass Ave Interchange (Boston, Massachusetts)

 invisible, road junction

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Actually the eastern end of Melnea Cass Boulevard, this overbuilt road was intended to be a section of Interstate 95, the primary express highway of the Eastern Seaboard of the United States. When a moratorium was declared on further highway construction inside Route 128, 95 was rerouted along that circumferential road, and this remnant never took on its intended use.

During the Central Artery/Tunnel project (the "Big Dig"), the ramps leading to and from Interstate 93 were scaled back, reflecting their actual use rather than their original planned purpose.

Until it was filled in the mid-1960s, this was the path of the Roxbury Canal, the last remnant of the South Bay that once encompassed all of the present Newmarket Square neighborhood.