Editing Chesapeake and Ohio Canal (section)

===Paw Paw tunnel===
{{Main|Paw Paw Tunnel}}
[[Image:Boat in Paw Paw Tunnel.JPG|150px|thumb|Paw Paw Tunnel]]

One of the most impressive engineering features of the canal is the Paw Paw Tunnel, which runs for {{convert|3118|ft|m}} under a mountain.<ref name="hahn7"/> Built to save {{convert|6|mi|spell=in|0}} of construction around the obstacle, the {{convert|3/4|mi|m|adj=on}} tunnel used over six&nbsp;million bricks. The tunnel took almost twelve years to build; in the end, the tunnel was only wide enough for single lane traffic.<ref name="pawpaw">[[#park-service|National Park Service]], "The Paw Paw Tunnel is 3118 feet (950 m) long and is lined with over six million bricks. The {{convert|3/4|mi|m}} long tunnel saved the canal builders almost six miles (10 km) of construction along the Paw Paw bends of the Potomac River. It took twelve years to build and was only wide enough for single lane traffic."</ref> One notorious incident included two captains who refused to budge for several days. The company official threw green cornstalks onto a roaring fire at the upwind portion of the tunnel, smoking the offenders out.<ref name="nps.gov"/>