PHILADELPHIA, PA, MAY 8, 2017 -- Workers in Philadelphia have excavated 205-year-old wooden water mains.
While crews were repairing a modern water line, they came across the wood mains, which had been left in the ground after being replaced years ago.
The mains were most likely installed around 1812. The city began replacing wooden pipes with cast iron in 1819, and the most recently discovered mains had not been in use since 1830s, according to The Associated Press.
The Philadelphia Water Department will keep the mains for educational purposes.
Learn more about the city's history of using wood water mains here.