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What is the most visited tourist attraction in Trier?
What is the largest religious site in Trier?
What is the most famous natural park in Trier?
Are tourist attractions in Trier free to visit?
Which attractions in Trier accept group tours?
What are the best attractions in Trier for family visits?
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Which attractions in Trier are accessible for visitors with disabilities?
What are the opening hours of the Porta Nigra?
Do attractions in Trier offer guided tours in English?
What are the entry rules for the Basilica of Constantine?
Are photography restrictions in place at any tourist attractions in Trier?
Is there a city pass available for discounted access to multiple attractions in Trier?
What safety guidelines should visitors be aware of at outdoor sites in Trier?