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Here's an ideal itinerary for 4 days in Erfurt:
Erfurt Cathedral, also known as St. Mary's Cathedral, is a stunning Gothic cathedral located in the heart of Erfurt, Germany. It was built in the 14th and 15th centuries and features intricate stained glass windows, towering spires, and beautiful vaulted ceilings.
Altstadt (Old Town) district in Erfurt is a charming and historic area with narrow streets, half-timbered houses, and beautiful architecture. It is home to many shops, restaurants, and cafes, as well as several important landmarks such as the Erfurt Cathedral and the Krämerbrücke bridge.
Erfurt Christmas Market is one of the oldest and most traditional Christmas markets in Germany, featuring over 200 stalls selling handmade crafts, local food and drinks, and festive decorations. Visitors can also enjoy live music and entertainment throughout the market.