"The Seven Foot Knoll Lighthouse was the second screwpile lighthouse built by the U.S. Lighthouse Service. It was originally located 15 miles southeast of this location. The 47-foot-high, round, screwpile lighthouse was completed by the Baltimore "ironfounders" firm of Murray and Hazelhurst in 1856 at a cost of more than $30,000. It was a construction of rolled-iron plates, drilled and riveted together and supported on nine cast-iron screwpiles. The screwpiles eliminated the need for an underwater masonry foundation. The light at Seven Foot Knoll marked the outer entrance to Baltimore's busy harbor and was manned until 1948, when the Coast Guard automated it. In 1988, the lighthouse was officially retired and with the help of a barge and 460-ton crane, moved to Pier 5 in Baltimore's Inner Harbor..." -From [a sign](https://historicships.org/explore/sevenfootknoll-lighthouse) near the lighthouse Created in RealityCapture from 1649 images taken with a drone.