Schloss Klosterhäseler, Medieval castle and former monastery in Klosterhäseler, Germany.

Schloss Klosterhäseler is a former monastery complex that now functions as a castle, featuring a distinctive octagonal stair tower on its southern side and multiple buildings arranged around an elongated central structure. The grounds have been restored and now house residential apartments, event spaces, and a winery within its historical walls.

The site was founded in 1239 as a Cistercian convent and was transformed into a castle around 1540 after the monastery's closure. This repurposing shows how secular powers reshaped religious sites following the Reformation.

Since 2005 the crypt of the former Cistercian convent has housed the Orgelbaumuseum Klosterhäseler, an organ-building museum. Its collection documents organ construction in the region, not monastic instrument use. Other parts of the castle now serve as flats, event rooms and a winery.

The castle stands on An der Poststraße in Klosterhäseler, in the Burgenlandkreis of Saxony-Anhalt. Parts of the building are used for events, flats and a winery, while the organ museum in the crypt has its own opening arrangements. Check current visiting options before travelling, as access is tied to these uses rather than to regular castle tours.

A Gothic crypt from the early 14th century lies beneath the castle and still preserves original architectural elements from the monastic period. This hidden sanctuary beneath the modern living spaces reveals the deep historical layers of the site.