Pont du Gard
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The real thing is a famous Roman aqueduct over the Gordon River in France. It was built in the first century by the Romans to feed the City of Nimes and is a world heritage site. It is about 160 feet tall. At its peak it is estimated to have carried almost 9,000,000 gallons of water a day.
Ours has a lot fewer courses, but the general proportions are pretty good. The biggest problem is modeling the hillside which we built to fit the construction and not the other way around. I know: looks like a pile of blocks faded out a bit. We tried coloring them a green color but they looked like a pile of blocks painted green - not like a hillside. Ahh . . . that a real architect/engineer's life should be so easy!
We designed this in 2017 and it was built by Mark Deslauriers. It's about 5 feet wide and almost 2 feet tall.