Burgruine Praßberg, Medieval castle ruin near Wangen im Allgäu, Germany

Burgruine Praßberg is a hilltop castle ruin above the Argental valley at 606.3 m, near the Beutelsau hamlet of Wangen im Allgäu. Its bergfried measures 9.8 by 9.7 metres with 3.3-metre-thick lower walls and a high entrance; large dressed stones survive up to half its height. The site also held a palas, a zwinger and the St. George Chapel.

Abt Manegold von Böttstein-Mammern of St. Gallen had the castle built in 1123 as Brahsberc; the lords of Praßberg, St. Gallen ministerials, are named as owners in 1167. The Praßberg line held it until 1397, when it passed to the Schellenbergs, who sold it in 1411 to Heinrich von Summerau zu Leupolz. Sequestrated for debt in 1731, it was forcibly sold for 99,000 guilders to the Freiherren von Westernach zu Kronburg, who resold it in 1749 to Count Joseph Franz von Waldburg-Wolfegg. It was still inhabited until 1835 and only a ruin from 1846, when parts were dismantled.

The castle chapel, dedicated to St. George, was first mentioned in 1414 and survived the 1846 demolition. It remained in good condition into the 1950s, received an emergency roof in 1977, but decay and vandalism continued. A legend tells of a white-clad maiden said to appear in a tower opening of the bergfried, often between three and five in the afternoon.

The ruins are accessible by foot through paths starting from the old Praßberg mill area and involve a moderate uphill walk. The site sits in forested and open terrain, so seasonal conditions like mud or overgrowth should be considered.

The tower preserves its original entrance positioned high above ground level, a rare surviving example of medieval defensive design. This construction method made the structure difficult to access for intruders.