Burg Bichishausen, Medieval castle ruins in Münsingen, Germany.

Burg Bichishausen is a castle ruin located on a hilltop in the Große Lautertal valley in Württemberg. The remains include sections of the outer fortification wall, foundations of the central keep and residential structures, along with the courtyard layout that reveals where the original tower once stood.

Construction of the castle began in the early 13th century as a strategic fortification for the region. From the 16th century onward, the Treisch von Buttlar family used it as their residence before abandoning the site around the middle of that century.

The castle served as a residence for the noble Treisch von Buttlar family, who shaped the area for generations. Its elevated position made it a visible symbol of power and control for people living in the valley below.

The castle ruins are open to the public at no cost, allowing visitors to explore freely at their own pace. The steel stairs and uneven ground surfaces require care, especially when wet, so sturdy footwear and caution are recommended when moving through the site.

A 1306 note records that a tower was demolished around 1300 "to make his own castle stronger" — likely an older keep replaced by the massive shield wall. During the 1973 restoration, the stump of the 13th-century keep was uncovered, so the tower visible today is that surviving base, not a structure never destroyed.