On the north side of the road.

The Altenbeken Viaduct (also known as Bekeviadukt or Großer Viadukt Altenbeken) is the longest limestone railway bridge in Europe, stretching 482 meters with 24 arches and rising 35 meters high. Built in 1853 by the Royal Westphalian Railway Company and inaugurated by King Frederick William IV, it transformed Altenbeken into a railway town and remains a key part of the HammWarburg railway. 

During World War II, it was one of Germanys most strategically important railway bridges and became a prime target of U.S. and Allied bombers, suffering heavy destruction in 1944 and 1945 before being rebuilt and reopened in 1950. As of 2025, the Altenbeken Viaduct continues to serve as an active railway bridge while also standing as a historic landmark, tourist attraction, and cultural symbol of Altenbeken.

Source of information: en.wikipedia.org

Source of photos: en.wikipedia.org, www.google.com/maps