Keyhole Tunnel, Vernon, Connecticut:
The oldest and longest keystone arch tunnel in the Nutmeg State is a 180-foot long passageway in the Talcottville section of Vernon. Stonemasons and stonecutters of the Hartford Providence Railroad and the Fishkill Railroad erected the tunnel between 1846 and 1849 using only oxen and hand tools. It was made of sandstone quarried from Box Mountain. One of the masons, Jerry Grady, carved his name inside of the tunnel. Today, Hop River State Park Trail has replaced the old rail line that once operated above the tunnel, from Manchester to Vernon to Bolton and back again.
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