April to October:
Wednesday to Sunday 10 a.m. to 5 p.m.
Mondays & Tuesdays, or on public holidays, as well as for groups, upon request.
November to March:
Saturday and Sunday 10 a.m. to 5 p.m.
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For groups: from 20 people all year round
(also outside of the opening times) with advance notice!
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You can find the Heldenberg opening times
here.