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C&O Canal National Historical Park

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Monocacy Aqueduct
Monocacy Aqueduct
While hiking the picturesque 184.5-mile C&O Canal Trail, one will come across eleven stone aqueducts originally designed to carry the canal across several of the Potomac River's tributaries. Completed in 1833, this 516-foot limestone aqueduct with seven arches spanning 54 feet, is the canal's largest intact structure. It's a civil engineering marvel that has withstood Civil War, hurricanes, and floods.
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