The Kalkberg is a 91-metre-high rock in the center of Bad Segeberg. The name is a misnomer as it is not made of limestone, but from gypsum.
Wikipedia https://en.wikipedia.org/wiki/Segeberger_Kalkberg
Address Bad Segeberg 23795, Germany
Coordinates 53°56'7.727" N 10°19'0.516" E