Tucked into the yard behind the tourist office (from where you access it), this museum's collection mostly celebrates the rich grave finds from Roman Tienen, with highlights including a vividly recreated funerary scene of a site found near Tienen station in which a horse, three dogs and a human were sacrificed.
The pottery phallus was apparently used to bless bronze-making rather than anything more sordid. The museum is within a curious little spired stone building originally built as a prison/police station in 1848 using stones recycled from a former city gate.