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Tallinn, Estonia
The Estonian capital’s 13th-century walls were once one of the strongest defense systems in Northern Europe. More than half of them are intact—including 26 towers, two full city gates, and two partial city gates. For an epic view of Old Town Tallinn, take a walk on the section of the walls that connects the Nunne, Sauna, and Kuldjala towers. It does cost a few euros to walk this stretch, but it’s a bargain for these priceless vistas.
