Geographic Knowledge about Germany, Part Two

I would be happy for response:
Are these Quizes fun or rather a source of desperation?
The Idea is, to work out Quizzes for those, who are very familiar with geography.
I often read the Comment in Geographie-Quizzes: Too easy.
Quiz by um
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Last updated: November 9, 2017
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First submittedNovember 8, 2017
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Longest Rivers (only the distance, which it flows through Germany)
Rhine
Elbe
Danube
Main
Weser
Saale
Spree
Ems
Neckar
Havel
Werra
Leine
Isar
Aller
Weiße Elster
Biggest Lakes of Germany by Surface Area
Bodensee (See is the German Word for Lake)
Müritz
Chiemsee
Schweriner See
Starnberger See
Ammersee
Plauer See
Kummerover See
Steinhuder Meer (Meer is the German Word for Sea, Ocean)
Großer Plöner See
Schaalsee
Serenter See
Koelpingsee
Geiseltalsee
Tollentesee
Walchensee
Forggensee (At this Reservoir you would find Neuschwanstein Castle)
Biggest German Islands
Rügen
Usedom
Fehmarn
Sylt
Föhr
Pellworm
Poel
Borkum
Norderney
Amrum
Langeoog
Ummanz
Spiekeroog
Hiddensee
Juist
Important Landmarks
Miniature - Wonderland
Neuschwanstein Castle
Historic City of Heidelberg
Cologne Cathedral (UNESCO World Heritage)
Historic City with Cathedral of Erfurt
Phantasialand
Monastic Island of Reichenau (UNESCO World Heritage) and Island Mainau / Bodensee
Imperial Cathedral in Speyer (UNESCO World Heritage)
Nationalpark Harz with Brocken
Roman Monuments, Cathedral of St Peter and Church of Our Lady in Trier (UNESCO World Heritage)
Historic City of Regensburg with St. Peter-Cathedral (UNESCO World Heritage)
Nationalparkregion Saxon Switzerland
Hansetown Lübeck with Holsten Gate (UNESCO World Heritage)
Sanssouci Palace in Potsdam (UNESCO World Heritage)
Museum Island Berlin (UNESCO World Heritage)
Bordering Countries
Denmark
Poland
Czech Republic
Austria
Switzerland
France
Luxembourg
Belgium
Netherlands
+1
Level 63
Jun 15, 2018
The landmarks need some kind of clarification. The Brandenburg Gate is probably the most well known German landmark yet it's not included.