The WeltWald Harz up to 2009 Arboretum Bad Grund, also known as Exotenwald and sometimes called the Arboretum des Forstamtes Grund or the Forstaboretum der Niedersächsischen Landesforstverwaltung, is an arboretum located along the B 242 federal highway near the Hübichenstein, northwest of Bad Grund, Lower Saxony, Germany. It is open daily without charge.