Gais has a cultural and historical gem: the old mortuary chapel, the so-called ‘Beinhaus’, has been converted into a small museum. The centrepiece of the museum is a cycle of frescoes from the late Gothic period depicting the Last Judgement. Next to it are the works on the redemption of the poor souls, a kind of catechism for believers who could not yet read at the time. In addition, the Sonnenburg vestments (several precious chasubles) can be admired in a glass display case and St Constantine II (a full-body skeleton) in a reliquary.