Bike the C&O Canal towpath from Georgetown to Harper's Ferry.
http://www.nps.gov/choh
http://www.candocanal.org/img/09.jpg
http://www.nps.gov/choh/History/Images/Historic%20Photos/old.aqueduct.jpg
http://www.nps.gov/choh
http://www.candocanal.org/img/09.jpg
http://www.nps.gov/choh/History/Images/Historic%20Photos/old.aqueduct.jpg