The Hohensyburg, also known as Sigiburg, is a historic castle ruin in the Dortmund district of Syburg, which looks back on an eventful history. Its origins date back to the 8th century, when a Saxon rampart was built at this strategically important location. In 775, the complex was conquered by Charlemagne and served from then on as a Frankish fortress. Around 1100, a stone castle made of Ruhr sandstone was built here, but it was partially destroyed in 1287.  
Today, the remains of the castle are a popular tourist destination and offer an impressive view over the Ruhr valley and the Hengsteysee. In addition to the castle ruins, the site includes the Vincketurm, an observation tower built in 1857 in honor of Ludwig von Vincke, and the Kaiser Wilhelm Memorial from 1902, which depicts Kaiser Wilhelm I on horseback, flanked by Otto von Bismarck and Helmuth von Moltke. 
The Hohensyburg is a worthwhile destination for cyclists. The journey takes you through picturesque landscapes, and there are numerous paths to explore. The combination of historical significance, impressive architecture and breathtaking views makes the Hohensyburg a highlight for every visitor.