Yes, there's 'count'-less cliches when reeling off Transylvanian tourist recommendations, but you probably didn't think a theme park would be on the list. Especially one inside a salt mine.

Topping our ranking of Europe's best underground attractions is Salina Turda. After visiting the complex's salt museum with its fascinating history, you can have hours of fun in its mini amusement park. Bowling, billiards, mini-golf and a 66-foot (20m) panoramic wheel – the only underground Ferris wheel in the world – will keep you busy all day.

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