The Naturhistorisches Museum in Vienna is definitely worth a visit. For students it is only €5 entry and I spent the best part of 4 hours in there, and could have spent more. The displays were very focused, in a chronological order and alongside A LOT of stuffed animals, there were rocks, ancient artifacts, fossils and animal skeletons. Avoid the cafe as it is very overpriced, although the food is very good and be prepared for some of the information (especially around the dinosaurs) to be more tailored towards children.
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