Near Lostorf

Visible from afar, above the village, on the eastward-sloping spur of the Dottenberg, stands the Wartenfels Castle, which at its core consists of a small 13th-century castle. The castle took on its present form in the 17th and 19th centuries, when it was rebuilt into a manor house in Solothurn country house style. It also has a chateau chapel, dating back to around 1750 and a French garden.
The Lostorf mineral spring, a gypsum and sulfur spring, is used as a thermal bath. After a fire in 1966, the thermal bath was rebuilt and used as a convention and seminar center. The hotel and thermal bath are currently closed. Furthermore, part of the golf course Heidental is located in the municipality of Lostorf.
Source: Wikipedia