Auburn Tunnel

Auburn Tunnel was a 19th-century canal tunnel built for the Schuylkill Canal near Auburn, Pennsylvania. It was the first transportation tunnel in the United States. The tunnel was deliberately added to the canal as a novelty, as the hill it was bored though could have easily been bypassed. It became a major attraction, with people traveling over 97 miles (156 km) upriver from Philadelphia to see it. It was periodically shortened, and in 1857 was daylighted to become an open-cut.

Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).