Can I substitute another attraction for the Skywalk Observatory ticket included in my Boston CityPASS? August 10, 2020 21:36 Updated Yes, since Skywalk is permanently closed, the Franklin Park Zoo will accept your Skywalk Observatory ticket. Related articles Can I visit the attractions more than once with one CityPASS tickets? How do I upgrade my Empire State Building ticket with New York CityPASS tickets or C3 tickets? Why is One Liberty Observation Deck no longer in the Philadelphia CityPASS attraction line-up? Boston CityPASS Attraction Schedule Updates Atlanta CityPASS Attraction Schedule Updates