This is the 12971st most frequent German word.
zurich
"Zürich" is the name of the largest city in Switzerland; it is not a German word with a translatable definition.
In this case, 'Zürich' signifies the city, and the sentence describes traveling through it, focusing on tourist attractions there.
Wir sind durch Zürich gereist, um die Sehenswürdigkeiten zu besichtigen.
We traveled through Zurich to visit the sights.
In this sentence, 'Zürich' refers to the Swiss city named Zurich and is used as a proper noun indicating a location.
Ich habe nächste Woche eine Geschäftsreise nach Zürich.
I have a business trip to Zurich next week.
Here, 'Zürich' is again used as a proper noun, describing the city and its characteristics.