Cologne sits on the Rhine — Germany's fourth-largest city, whose twin-towered cathedral (UNESCO) is Europe's tallest Gothic church after 600 years of construction. Cologne is also Germany's beer capital (Kölsch), the Christmas market at Domplatz is Germany's most atmospheric, and the Rhine promenade is the city's heart.
December (Christmas markets) or April–September (best weather); winter is also charming
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