Waldenburg Castle, also known as Schnellenberg Castle, is a fascinating castle ruin located near Attendorn, North Rhine-Westphalia, Germany. Its history dates back to the 12th century when it was first built. The castle changed hands several times over the centuries and played an important role in the history of the region. Originally, Waldenburg Castle was built as a fortress to protect the strategically important trade route in southern Westphalia. In the course of time, it became a residence for noble families, who extended and remodeled the castle. Among others, it…