My maternal grandfather told me that Cumberland, MD had the map of the continental USA in its lights............house lights/street lights....................we went to a hill overlooking said city........but i couldn't tell...........when i was a kid...............we were visiting my mother's younger brother..........who had moved there..................he had the family business...............and relocated it there........the Doll Reader.........

Chesapeake and Ohio Canal
The Chesapeake and Ohio Canal at Lock 20
Specifications
Length	184.5 miles (296.9 km)
Maximum boat length	90 ft 0 in (27.43 m)
Maximum boat beam	14 ft 6 in (4.42 m)
Locks	74 (Boats must pass guard locks 4 & 5 for each trip.)
Status	National Park
History
Original owner	Chesapeake and Ohio Canal Company
Principal engineer	Benjamin Wright
Other engineer(s)	Charles B. Fisk, William Rich Hutton
Date of act	1825
Construction began	1828
Date of first use	1830
Date completed	1850
Date closed	1924
Geography
Start point	Georgetown, Washington DC (originally Little Falls, MD) (Canal extended down to Georgetown in 1830)
End point	Cumberland, MD (originally Sections to Pittsburgh, PA never built)
Connects to	Alexandria Canal (Virginia), Goose Creek & Little River Navigation