The Fährenpfortenturm (also Hagelturm or Natermannturm) is a former defense tower in Hann. Münden in southern Lower Saxony. The 40-meter-high tower belonged to the medieval city fortification Münden and was built as a wall tower of the city wall. In the 19th century, the building was increased and used as a scrap iron tower. The listed tower now houses the Museum of Labor.