Kaiserburg, Medieval castle ruin in Oberhausen, Germany.
Kaiserburg is a castle ruin on Ulrichsberg hill in Oberhausen, Bavaria, situated at about 454 meters elevation. The limestone walls that remain show how a medieval fortress was laid out and what materials builders used for its construction.
The fortress was built between the 10th and 11th centuries and served first as imperial property. It later became a border stronghold for the counts of Graisbach, changing its role in regional power struggles.
The castle's teardrop-shaped design reflects medieval defense strategies that visitors can trace in the remaining walls. Walking around the site helps you understand how such fortifications were planned and built during that era.
Multiple walking paths lead you up to the ruins and through the site. The location is freely accessible and requires no entrance fee, making it easy to explore at your own pace.
The walls are built from siliceous limestone, a local stone that was readily available in the surrounding hills. This choice of material reveals how medieval builders often used what the landscape nearby could provide.
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