6Heidelberg

The 19th-century romantics found sublime beauty and spiritual inspiration in Heidelberg, Germany’s oldest university town, and so, in his way, did Mark Twain, who was beguiled by the ruins of the hillside castle.

All of this has left its mark on the modern-day city, where age-old traditions endure alongside world-class research, innovative cultural events and a sometimes raucous nightlife scene.

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