This impressive structure was one of several signal towers built in 1901 for Boston's first elevated railway. This one, Tower C, was near North Station. A towerman on the second floor controlled switches and signals at a junction on the El. Boston architect Alexander Wadsworth Longfellow, Jr. (nephew of poet Henry Wadsworth Longfellow) designed this and other structures for the first Boston El line. It features an ornate, copper clad exterior. When the segment of elevated line running by Tower C was replaced with a subway line, Tower C was brought to Seashore, travelling most of the way by boat because of its large size.