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Here's an ideal itinerary for 5 days in Frankfurt:
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Frankfurt Cathedral, also known as St. Bartholomew's Cathedral, is a stunning Gothic church located in the heart of Frankfurt, Germany. It was originally built in the 14th century and has undergone several renovations over the years. The cathedral is known for its impressive architecture, including its towering spire and intricate stained glass windows.
Senckenberg Natural History Museum Frankfurt is one of the largest natural history museums in Germany, featuring a vast collection of exhibits on biodiversity, evolution, and ecology. The museum also houses a research institute and a library.