It allows to to go to the best attractions in Seattle. Space Aquarian etc..
Theres a few options. The popular one lets you visit the Space Needle, Aquarium, Harbor Boat tour and 2 if these: Pop Culture Museum, Chulily Museum or the Zoo. You pay one fee instead of all the entrance fees and also get a coupon book. Its a bit cheaper if you plan on seeing all of those places
City Pass is kind of ticket sold online in USA to visit some important places of a few cities like Seattle. Using City Pass one can avoid queue.
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