Helfenberg Castle, Renaissance castle in Helfenberg, Austria.

Helfenberg Castle is a Renaissance structure built 300 meters higher than its original location, featuring architectural details from the early 17th century. Inside, an extensive library makes the building stand out as a learning center from that period.

The castle was first mentioned in 1224 when Wirint de Helfenberch appeared in records of Hohenfurt monastery in Upper Austria. The property later passed through several noble families who shaped it into its current form through renovations in the early modern period.

The castle chapel, closed under the Seeau family in 1785, was restored by the Revertera family, who gave it a new altar. The name Revertera recalls a family that came from Spain via Naples under Emperor Charles V and produced diplomats and senior officials. In the baroque ornamental garden stand six stone gnomes in the style of Johann Josef Wanscher, dating from the early 18th century.

The castle is private property of the Revertera family and can be viewed only from outside. Visitors should focus on observing the exterior and surrounding grounds, as access to the interior is not permitted.

Hans Christoph von Oedt assembled a large library here in 1607, making it an unusual learning center for Upper Austria at that time. This book collection gave the castle intellectual influence in a region where such repositories were quite rare.