What do you suggest visiting in Austria?

We decided to test whether the car can handle long ranges by going to Austria next week. It's a large country with numerous places, so I want to ask your help. Have you ever been to there?

EDIT: Thanks the suggestions for everyone, they were really useful!

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You can't just DRIVE to Australia! It's a whole other continent. It's across the ocean and stuff. ...

When I was child I thought they are the same places, even though Austria is our neighbour country. 😄