The Fort McHenry Tunnel is one of two tunnels that carry traffic underneath Baltimore Harbor. It is named for Fort McHenry, which it passes.
The tunnel, opened on November 23, 1985, closed a gap in the East Coast's most important interstate route, Interstate 95, between Maine and Florida. It also is the largest underwater highway tunnel and the widest vehicular tunnel ever built by the immersed-tube method. At the time of its opening it was the most expensive underwater tunnel project in the United States, but has since been surpassed by the Big Dig project in Boston. The tunnel is one of seven toll facilities operated and maintained by the Maryland Transportation Authority.
The current toll rate for cars is $2.00, paid in both directions. Vehicles with more than two axles pay an additional $2.00 per extra axle. The tunnel has several dedicated E-ZPass lanes in its toll plaza in both the northbound and southbound directions.

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Baltimore Harbor Tunnel
Highways along the BosWash corridor