The steamship City of Glasgow vanished in 1854 during a transatlantic voyage from Liverpool to Philadelphia with nearly 500 passengers and crew on board. Despite extensive searches, no trace of the ship was ever found. The incident heightened concerns over the safety of ocean travel in the 19th century, as families in the United States awaited news that never came. This mysterious disappearance remains unsolved, symbolizing the era's ongoing uncertainties around maritime safety.