Frankfurt, Germany: This financial and modern powerhouse of Germany also has plenty of Old World charm, making it the perfect city for travelers who want a little bit of everything. Click through the gallery for more photos of what to see in Frankfurt:
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Römerberg: If you're looking for classic German architecture vs. modern skylines, head to Frankfurt's beloved central square. People have been gathering at this spot since the ninth century.
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Historiches Museum Frankfurt: This is a great place to learn more about the deep history of the city, including pictures and paintings of people who lived here decades and centuries ago.
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Alte Oper: This classic opera house was heavily damaged in World War II and was not rebuilt and reopened until 1981. Come here for a grand night of culture or take a guided tour for a look behind the scenes.
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Frankfurt Zoological Gardens: Baby lions are just the beginning of the animals you'll see here. It's one of Europe's oldest zoos, dating back to the 1850s.
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Städel Museum: Visitors have been admiring works of art here for more than 200 years. It holds everything from Old Masters to modern and contemporary works.
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Main cruise: A cruise on the River Main is a fabulous way to relax and see the city from a different vantage, including Frankfurt's modern skyline.
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Frankfurter Flohmarkt: This flea market rotates locations: The Schaumainkai promenade on the Main's south side (pictured here) and another site on Lindleystrasse around the Osthafen docklands. Pick up interesting souvenirs and people-watch here.
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Main Tower: Visitors stand on the observation deck of the Main Tower, which offers unparalleled views of Frankfurt and beyond.
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Kleinmarkthalle: If it's a nice day, perhaps you can assemble a picnic lunch from the many choices at the Kleinmarkthalle.
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Kloster Eberbach: While Germany seems to go with beer, there are plenty of places for wine lovers to visit. That includes Kloster Eberbach, a superb example of medieval monastic architecture.