Hello, can someone explain the last part for me? I think there's something missing (maybe a verb).

"In der Mitte der Binnenalster können Sie ein spezielles Wahrzeichen Hamburgs bewundern, die große Fontäne, ein beliebtes Fotomotiv begeisterter Besucher."

Thank you.

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@thescorpion

An apposition doesn't need to have the grammatical gender or even the number of the name or noun it describes. It's a completely separate noun phrase that is just put there without any conjunction or anything other than a comma or a colon (Doppelpunkt). However, it usually stands in the same grammatical case. (Except for when it starts with e.g. "wie" – then the apposition can be in the nominative case...)

The article "ein" here reflects the neuter gender of the noun "das/ein Fotomotiv" – which stands in the accusative case here because it is an apposition to "die große Fontäne", which in turn is an apposition to the direct object (Akkusativobjekt) to the verb "bewundern": "ein spezielles Wahrzeichen Hamburgs".

In der Mitte der Binnenalster können Sie
[ein spezielles Wahrzeichen Hamburgs]ᴬᴷᴷ bewundern,
[die große Fontäne]ᴬᴷᴷ,
[ein beliebtes Fotomotiv {begeisterter Besucher}ᴳᴱᴺ ]ᴬᴷᴷ.