Schloss Gutenhaag, Castle in Hrastovec, Municipality of Lenart, Slovenia

Schloss Gutenhaag is a medieval castle in Hrastovec v Letih Goricah featuring three round towers on its northern section and a wedge-shaped southern portion that encloses a courtyard facing north. The structure is organized around this central court, creating the layout typical of medieval fortifications from this region.

A small border fort on a low hill above the Pesnica valley, first held by the Gutenhaag family and recorded as a lordship seat after 1227. The Hollenegger family followed, and the Counts of Herberstein owned it from 1482 to 1802 and again from 1909 to 1941. Since 1948 it has housed a social welfare institution.

The castle's name comes from the oak (hrast) that once dominated the surrounding forests; the German name Gutenhag refers to the same estate. The Herberstein counts added the castle's name to their own title after acquiring it in 1481. A local legend tells of Agata, secretly married to Count Friderik Herberstein in the 16th century and executed after being accused of witchcraft; a black cross near Lake Komarnik marks the story.

The building now operates as a psychiatric facility and is not open to the public for interior visits. It can be viewed from the outside as a protected monument of local significance in the area.

The south wing is an early 16th-century addition, yet its portal carries the dates 1616 and 1655, showing that the entrance was reworked long after the wing was built. The north part, with three round towers, is the older core.