D. M.
Yelp
The Monocacy Aqueduct is an engineering marvel that is a part of the long-abandoned C&O Canal system. The C&O Canal was the interstate highway system of it's day, except the tractor-trailers were boats, and the power was provided by river current.
The aqueduct allowed the canal boats to safely traverse a natural river (in this case, the Monacacy River) on it's route.
I love coming here. It's interesting, it's peaceful, and it's a good walk around the aqueduct and one of the nearby locks. It is kind of out in the country, and it's not that easy to get to. It's not "interactive", there is no gift shop, there are no tours, just a tiny parking lot and the remains of what used to be something great.
Just one of the universe of reasons I like this place - from the Wikipedia entry for the Monacacy Aqueduct:
"During the American Civil War the Union used the canal to transport war materials and troops along the border between Maryland, Virginia, and points west. For this reason the canal as well as the aqueducts were often under Confederate attack. There were many Confederate sympathizers among the canal employees, including Thomas Walter, keeper of Lock 27. Walter loved the South, but he loved the Monocacy Aqueduct more. When he learned that Confederate General D. H. Hill had orders to destroy it in order to halt boat traffic during the Antietam campaign in September 1862, Walter convinced Hill that draining the canal would achieve the same end. Walter saved the Monocacy Aqueduct, only for it to be threatened once again a few days later when another Confederate party attempted to blow up the aqueduct. However, the soldiers were unable to drill enough holes into the hard stone to place enough explosives to breach the structure."
It remained standing then, and it still remains standing today, although unused for the purpose it was built.
If you're in the area, it's worth a visit.