The Falken manor, also called Heidelburg, is the remnant of a former hill fort on the hill Falken, northeast of Ittelsburg a district of Bad Grönenbach. There are only trenches and few remains of walls to see. The original complex dates back to the 10th century. The castle burned down in 1487 and was from 1492 in the possession of Heinrich von Rothenstein, a nephew of Konrad the Younger of Rothenstein. He was also the founder of the Rothenstein-Falken line. Heinrich von Rothenstein rebuilt the castle in 1496 again. 1505, a new building under Achar and Gangolf von Rothenstein was executed. In 1525, the castle was looted from the Allgäu heap. Until 1562 she remained in possession of Rothenstein. Thereafter, with the end of the Rothenstein-Falken line by the death of Hans Heinrich in 1562, the castle passed into the possession of his relatives Christoph von Bollstädt and was conquered by the Prince Kempten. The Fürststift gave Falken 1571 to Heinrich von Stein zu Niederstotzingen. In the years from 1642 to 1692, the castle was a nanny nursing office. After the secularization in 1803, the postman Dodel had the castle in his possession. In 1821 the plant was demolished by its then owner. The Falken Falken is a listed building.