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Walk across Boston's City Hall Plaza today, and you might never suspect that just beneath your feet lies a labyrinth of tunnels, portals, and chambers—remnants of the city’s once-thriving transit system. Approximately 15 feet underground, a forgotten trolley tunnel from 1898 rests sealed and unnoticed, a relic from the earliest days of America's subway history. This tunnel was part of the nation’s first subway system, carrying streetcars beneath two now-defunct stations. But the story of Boston’s subterranean transit network extends far beyond this single tunnel. Hidden beneath the city are up to five abandoned streetcar tunnels, alongside various lost subway passages, forming a disjointed mosaic of sealed portals, side tunnels, and underground platforms.