There is a remarkable amount of locks along the Cumberland and Ohio Canal. I can only imagine the staff needed to keep it running being a major cost of operations.

A view along the bike path connector from the C&O Trail near Paw Paw Tunnel to the village of Paw Paw on the other side of the Potomac River back in West Virigina.

Potomac River downstream of the Paw Paw Tunnel from the C&O Trail.

On the left side is Maryland, while on the right is West Virginia. In the distance is Town Hill, which is part of Maryland's Green Ridge State Forest.

Inside the Paw Paw Tunnel which is 3/4 mile long canal bypass under a mountain. The towpath is the hike/bike trail while you can kayak the canal itself. Both recommend either a good flashlight or a bright bicycle light (I had both, plus I was fairly nearly the south end).